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What 3 types of molecules are examples of signal molecules?

User Anto
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The majority of signal molecules are peptides and small proteins. Both are made of a chain of amino acids, the difference being the number of amino acids that make up the molecule. Generally, if the signal molecules has fewer than 50 amino acids it is considered  a peptide. If it has more it is considered a protein.
User Jalpesh Patel
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