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A ______ expresses a gene or genes that direct production of the signaling molecule, and the ______ expresses a gene or genes that direct production of the ______.

User Nak
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A __signaling cell____ expresses a gene or genes that direct production of the signaling molecule, and the _responding cell_ expresses a gene or genes that direct production of the _receptor protein_.

User Matrixanomaly
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