Problem: The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers, etc.) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. In this case, SHH is acting asa. A direct contact signal.b. An endocrine signal.c. A paracrine signal.d. An autocrine signal.

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The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers, etc.) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. In this case, SHH is acting as

a. A direct contact signal.

b. An endocrine signal.

c. A paracrine signal.

d. An autocrine signal.

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