
Molecular cloning introduction
Use the four stages to introduce the roles of exonuclease, polymerase and ligase. Identify the strand ends before explaining which end is resected or extended.
Explore this exampleGibson Assembly Diagram — Free Mechanism Editor
Keep overlaps, 3′ overhangs, internal gaps and repaired junctions consistent across an assembly explanation.
Gibson assembly diagram editor
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Keep overlaps, 3′ overhangs, internal gaps and repaired junctions consistent across an assembly explanation.
A Gibson assembly diagram explains how overlapping DNA fragments are joined through exonuclease treatment, annealing, polymerase filling and ligation. SciFig provides an editable teaching schematic of those stages, with defined strand direction and corresponding labels. Choose a mechanism stage and adapt its component names without changing the defined strand relationships. Create a labeled reference or a numbered exercise, export SVG or PNG, and save the current stage as a project.

Follow strand direction and enzyme action through overlapping, resected, annealed and repaired views.
The starting view shows three double-stranded fragments with terminal overlap regions. The strands run antiparallel, with separate labels for their 5′ and 3′ ends. These are teaching fragments rather than a submitted DNA sequence, so the picture can concentrate on orientation and the role of the shared terminal regions. Gibson assembly cloning uses terminal overlaps between adjacent fragments.
The exonuclease view removes material from the 5′ ends and leaves 3′ single-stranded extensions. The end anchors move to the remaining strand endpoints in that view. A separate overhang marker helps distinguish the exposed extension from the original fully double-stranded overlap. The Gibson assembly mechanism begins with 5′ resection that exposes complementary 3′ overhangs.
Complementary overlap regions align in the annealing view, with internal gaps still visible. The repair view fills those gaps from available 3′ ends and marks sealed junctions. The two views have different geometry, making polymerase filling and ligase sealing visible stages of the mechanism.
Switch among the starting fragments, exonuclease, annealing and repair views. Each supports labeled, numbered, blank and answer modes. Move the text labels, export SVG or PNG, and save the current project to restore its stage and annotation settings.
Choose the mechanism stage, edit its labels and export a reference, exercise or corresponding answer.
Open the local editor and start with its labeled view. For an experiment or mechanism with multiple stages, choose the condition that matches the explanation you are preparing.
Select a part, edit its name and move the label endpoint with the pointer or coordinate controls. Its structure anchor stays attached to the defined component.
Switch to numbered, blank or answer mode as needed. The practice figure and its answer list use the same part order for the selected structure or stage.
Download SVG or PNG from the current valid figure. Save project JSON when you want to restore the labels, positions and display mode for another session.
Use the strand mechanism for cloning introductions, orientation exercises and protocol illustrations.

Use the four stages to introduce the roles of exonuclease, polymerase and ligase. Identify the strand ends before explaining which end is resected or extended.
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Place annealing and repair exports beside each other. Use the visible internal gaps and filled junctions to explain the transition.
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Export a numbered starting or exonuclease view and ask learners to identify 5′ ends, 3′ ends and overhangs. Match the answers to that selected stage.
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Include a mechanism figure beside an assembly protocol. Keep experimental sequences, reagent amounts and incubation settings in the protocol itself.
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Use this figure to explain how fragments join, then use a plasmid map to discuss the resulting circular construct and its features. The two figures serve different tasks.
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Rename the schematic fragments and export vector artwork for a presentation. Save the project to preserve the chosen mechanism stage and label placement.
Explore this exampleThe starting Gibson assembly diagram shows three double-stranded fragments with terminal overlap regions. I kept the strand-end labels visible to establish antiparallel orientation before the enzyme steps. The figure is a mechanism example, so the colored fragments communicate direction and overlap without implying sequence validation.
SciFig · Overlapping fragments
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Gibson assembly diagram editor
Choose a view, edit structure labels and move label endpoints. Export the labeled diagram, numbered worksheet or answer key.