Which type of proteins can function as chemical messengers or as receptors in the plasma membrane?

Name: Which type of proteins can function as chemical messengers or as receptors in the plasma membrane?
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Communication proteins can function as chemical messengers, such as hormones, or as receptors in the plasma membrane, binding to specific ligands to initiate cellular processes. The other types of proteins listed (enzyme, defensive, and transport) do not typically serve these functions.

Which Type of Proteins Can Function as Chemical Messengers or as Receptors