The protein Sonic Hedgehog (SHH)plays a role in specifying the identity of digits (such as fingers and toes)in mammals.Several digits arise directly from cells that both express and respond to secreted SHH.What type of signaling would this be considered?

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This is considered autocrine signaling because the cells that express Sonic Hedgehog (SHH) also respond to it. In autocrine signaling, cells produce signals to which they themselves respond, which is the case with the cells that both express and respond to SHH.

The Protein Sonic Hedgehog (SHH)plays a Role in Specifying the Identity