To which of the following residues of the protein, the protein kinases do not add phosphate groups?

To which of the following residues of the protein, the protein kinases do not add phosphate groups? Correct Answer cytosine

The protein kinases usually add phosphate groups to serine and threonine residues of their target proteins. A very important class of kinases also adds phosphate groups to the tyrosine residues.

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The signal sequences are typically _______ residues long, rich in _____ charged residues such as arginines as well as hydroxyl residues such as serines and threonines, but devoid of ______ charged residues.
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