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Magnetic Cell Separator

A clean, editable magnetic cell separator for immunology and cell-isolation figures — a column in a magnet retaining magnetically labeled cells, ready to relabel.

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Magnetic cell separator showing a column in a magnet retaining labeled cells while unlabeled cells flow through, lab equipment icon (Figure generated with SciFig)

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What is Magnetic Cell Separator?

A magnetic cell separator is a benchtop instrument that isolates target cells by passing a cell suspension through a column held in a strong magnet. Cells tagged with magnetic beads are retained in the column while unlabeled cells flow through, enabling positive or negative selection. It is a common icon in immunology, stem-cell, and cell-therapy figures. With SciFig you describe the separator in plain language and generate a clean, editable magnetic cell separator, ready to relabel and export.

Why the separation step is drawn out

  • The direction of the enrichment is the claim. Positive selection (target retained on the column, labelled) and negative selection (target passes through, untouched) yield functionally different cells, and only a diagram makes clear which one was done.
  • Bead retention on positively selected cells can occlude the epitope and even signal through it, so a figure that does not indicate the selection mode leaves a real confound unstated.
  • It anchors purity claims: a schematic that shows starting material → labelling → column → flow-through and eluate gives the reader a place to hang the pre/post purity percentages from the cytometry panel next to it.
  • It is a column-and-magnet method, not a sorter. Conflating it with FACS in a workflow figure misstates the throughput (10⁸–10⁹ cells in minutes, bulk, no per-cell decision) and the level of resolution achievable.

Parts of the schematic

  • The permanent magnet assembly and the column seated in its gap — the ferromagnetic matrix or spheres inside the column are what amplify the field into steep local gradients, and drawing that matrix is what explains why the cells stick.
  • The magnetic label itself: antibody-conjugated superparamagnetic beads. Size is a real distinction to encode — nanoscale beads (~50 nm) are designed to be left on the cell, while larger micron-scale beads generally require a release or detachment step.
  • Direct versus indirect labelling: an antibody-bead conjugate binding the target antigen directly, versus a primary antibody (often biotinylated) followed by an anti-biotin or secondary bead.
  • The two output fractions, drawn and named without ambiguity: the flow-through (unlabelled cells) and the eluate (labelled cells, released only after the column is taken out of the magnet and flushed with the plunger).
  • The selection mode, shown as two parallel branches: positive selection labels the target; negative selection labels everything else with a lineage-depletion cocktail so the target is never touched.
  • Optional but informative: buffer composition cues (degassed, EDTA-containing, cold) and a pre-filter, since clumps and DNA from dead cells are the standard cause of column clogging.

Figures it belongs in

  • Immunology methods: PBMC isolation followed by CD4⁺, CD8⁺, CD14⁺, or CD19⁺ enrichment, and untouched naive T cell isolation by depletion cocktail.
  • Stem-cell and haematology workflows — CD34⁺ progenitor enrichment from apheresis or marrow, and lineage-negative depletion prior to sorting.
  • Cell-therapy manufacturing schematics: T cell selection at the front of a CAR-T process, where enrichment is a GMP unit operation, not a bench prep.
  • Tumour dissociation pipelines: dead-cell removal, red-cell depletion, and CD45 depletion to enrich tumour cells before single-cell sequencing.
  • Two-step protocol figures where magnetic pre-enrichment feeds a downstream sorter — a common design that raises rare-event yield without the sorter's time cost.
  • Protocol SOPs and training slides where the column-in-magnet / column-out-of-magnet distinction is the entire operational point.

Magnetic Cell Separator— templates & examples

How to make Magnetic Cell Separator

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