Answer :

Final answer:

One of the side chain nitrogens in β2-h146 is protonated.

Explanation:

The side chain of β2-h146 has a positive charge, indicating that one or more of its side chain nitrogens are protonated. To determine the number of protonated side chain nitrogens, we need to examine the side chain of β2-h146. The β2-h146 side chain contains a histidine residue, which has a nitrogen-containing imidazole group. In its neutral form, the imidazole group has two nitrogen atoms, one of which can be protonated. Therefore, in the protonated form, there is one protonated side chain nitrogen in β2-h146.

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