Biology / Unit 2 Bio 0328 short lesson, about 20 seconds
How a Virus Exploits Membrane Receptors
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The idea
A virus can enter a cell by binding a cell-surface receptor the cell normally uses for another purpose, exploiting an existing doorway.
In practice
HIV binds the CD4 receptor on T-helper cells, hijacking a doorway normally used for immune signaling to enter and infect the cell.
Where people slip
The receptor's normal job is recognition, per Bio 0327 — the virus exploits an existing doorway.
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