A Previously Unknown Chemical Signal Is Discovered in Mice

A previously unknown chemical signal is discovered in mice.Five observations about this signal are listed.Which observation would serve as evidence in distinguishing whether this chemical signal should be classified as a juxtacrine or a paracrine signal?

A) The signal molecule is a protein.
B) Cells responding to the signal have receptors specific to the signal.
C) Cells producing the signal are not affected by the signal molecule.
D) The signal molecule is not present in blood.
E) The signal molecule is not present in extracellular fluid.

Correct Answer:

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