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Which of the following is not a reason for the selectivity of receptors towards messengers?

Which of the following is not a reason for the selectivity of receptors towards messengers? Correct Answer Location in the membrane

There are lots of different types of receptors in the body at different locations. They interact with different kinds of chemical messengers. Their selectivity for one messenger over the other is because of the difference in their binding sites, structure and composition of amino acids.

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