Discussion
Autocrine signalling occurs when a cell
Answer: C
Correct answer: responds to a signal it released itself
Autocrine signalling is a cell talking to itself: it secretes a molecule for which it carries the receptor. It is used to reinforce a decision a cell has already made - which is why it is common in development, where a group of neighbouring cells all releasing and receiving the same signal commits the whole group to one fate, and why it is a frequent feature of cancer cells driving their own proliferation.
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