During embryonic development, which of the following is not a quality of inducer molecules?
A: They are generally produced by the same cells they affect.
B: They bind to receptors on the plasma membrane of target cells.
C: They act through signal transduction pathways.
D: They may be proteins.
E: Inducer molecules have all of the above qualities.
Answer: A: They are generally produced by the same cells they affect.
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