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Free Complement System Diagram Generator

Select complement pathways and follow their convergence at C3, C5 and the membrane attack complex in one labeled mechanism figure.

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Free Complement System Diagram Generator— templates & examples

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Complement system diagram tools

Free Complement System Diagram Generator

Select complement pathways and follow their convergence at C3, C5 and the membrane attack complex in one labeled mechanism figure.

A complement system diagram shows classical, lectin and alternative pathways converging on shared complement components. Select complement pathways and follow their convergence at C3, C5 and the membrane attack complex in one labeled mechanism figure.

Create a complement system diagram
Classical, lectin and alternative complement pathways converging on shared C3, C5 and MAC stages
  • Show the classical pathway
  • Choose the visible branches
  • Use shared C3 nodes
  • Identify the terminal MAC stage

Complement System Diagram Features

SciFig’s complement system diagram brings the inputs, diagram choices and exported result into one focused tool.

Compare the three activation pathways

Display classical, lectin and alternative complement activation in one overview. Each branch retains its initiating context before reaching the shared downstream cascade. This side-by-side organization helps a reader distinguish pathway initiation from the common components that follow.

  • Show the classical pathway
  • Show the lectin pathway
  • Show the alternative pathway
Compare the three activation pathways

Focus on a selected complement branch

Turn individual pathways on or off when the explanation concerns one route. A classical-pathway lesson can keep its branch visible without carrying the other initiating stages into every discussion. The shared downstream components stay connected to the selected route instead of becoming separate duplicated cascades.

  • Choose the visible branches
  • Keep initiating stages distinct
  • Retain the connected downstream cascade
Focus on a selected complement branch

Follow convergence through C3 and C5

Show the common C3 and C5 stages once, even when several initiating routes are visible. The shared geometry makes convergence explicit and avoids presenting three independent terminal cascades. Label these nodes so that the figure can connect the overview with a more detailed discussion of complement mechanisms.

  • Use shared C3 nodes
  • Use shared C5 nodes
  • Keep branch convergence visible
Follow convergence through C3 and C5

Show the terminal membrane attack complex

Use SciFig’s complement system diagram to retain the terminal MAC stage after the common cascade and choose the labels needed for your explanation. Export SVG or PNG with the selected branches and shared nodes. The resulting mechanism figure organizes complement activation rather than simulating reaction rates or predicting clinical outcomes.

  • Identify the terminal MAC stage
  • Edit complement labels
  • Download the pathway figure
Show the terminal membrane attack complex

How to Create the Figure

Use the complement system diagram controls below to prepare the figure from your selected mechanism and labels.

  1. Choose a complement pathway view

    Start with all three initiating pathways for an overview or a focused branch preset. The classical, lectin and alternative routes lead toward shared downstream components. Choose the starting view according to whether your material compares initiation routes or follows a single route.

  2. Select the initiating branches

    Use the classical, lectin and alternative pathway controls to choose the visible branches. C3, C5 and the terminal MAC stage remain shared downstream. The preview lets you follow the selected initiation route without drawing separate copies of the common cascade.

  3. Edit the title and labels

    Enter a descriptive title and replace the node or structure labels with the terminology used in your document. The preset retains its arrangement while the visible names change. Keep molecular abbreviations consistent with the explanation beside the figure.

  4. Download the labeled figure

    Choose SVG for a scalable vector figure or PNG for a slide, handout or document. The exported diagram retains the selected view and labels. Keep the figure alongside the corresponding explanation so later wording changes can be reflected in another export.

Complement System Diagram Uses

Use a labeled complement system diagram to connect the explanation in your material with a visible figure.

Classical, lectin and alternative complement pathways converging on shared C3, C5 and MAC stages

Introduce complement in immunology

Use the three-pathway overview to introduce complement activation before describing individual proteins. Show how distinct initiating routes reach shared downstream components. A labeled PNG gives students a reference figure that can accompany the explanation in lecture notes or a handout.

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Classical complement pathway connected to the shared C3, C5 and membrane attack complex stages

Explain classical pathway initiation

Select the classical branch for a focused discussion, then retain the common C3, C5 and MAC stages downstream. This keeps the pathway connected to its outcome without filling the slide with other initiating routes. Add the labels used in the accompanying course material.

Explore this example
Classical, lectin and alternative complement pathways converging on shared C3, C5 and MAC stages

Compare lectin and alternative pathways

Place both selected branches in one figure to discuss their different initiating contexts and shared cascade. The common nodes remain visible once. This helps a seminar audience compare the routes without mistaking repeated labels for separate terminal systems.

Explore this example
Shared C3 and C5 cleavage stages leading to the C5b–9 membrane attack complex after three complement pathways

Teach pathway convergence

A mechanism lesson can emphasize the points where distinct complement routes meet. Keep C3 and C5 labels visible and follow the common route toward MAC. The figure communicates convergence as a structural relationship rather than as a quantitative time course.

Explore this example
Shared C3 and C5 cleavage stages leading to the C5b–9 membrane attack complex after three complement pathways

Prepare an innate-immunity panel

Export a complement schematic for a broader presentation about innate immunity. The selected branches provide mechanism detail, while a separate immune-response diagram can show how innate and adaptive processes relate. Each figure retains a clear role in the explanation.

Explore this example
Classical complement pathway connected to the shared C3, C5 and membrane attack complex stages

Connect antibodies with complement

Use the complement diagram when discussing how antibody-associated classical activation connects with the common cascade. Pair it with an IgG structure figure when introducing antibody regions. The structure panel and pathway panel answer different questions without conflating complement with antibody variable-region terminology.

Explore this example

How Researchers Use SciFig

My introductory slide showed three separate terminal cascades, which made the pathways look unrelated. The complement system diagram kept C3, C5 and MAC shared after the initiating branches. I exported the combined view so students could compare the beginnings while following their convergence into the same downstream mechanism in the notes.

Lea C.

Immunology lecturer, University of Antwerp

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