Cyclic AMP (cAMP) is not used for extracellular signaling; it is an intracellular signaling molecule, acting as a second messenger within cells to transmit signals received from extracellular stimuli.
Which of the following signal molecules is not used for extracellular signaling?
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Question context
This question is part of 🧬 Biochemistry within the broader 🧬 Medical Science subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.