nsulin is present in very small concentrations in our blood (10-12 M, or picomolar). However, when 1 molecule of insulin binds to its receptors, it activates many molecules of tyrosine kinase inside the cell and creates a meaningful response. This is an example of ____________________. a) Second messenger b) Amplification c) Lipophobic ligand d) G-protein coupled receptor e) Gene transcription

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