Formaldehyde primarily reacts by crosslinking which group?

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Multiple Choice

Formaldehyde primarily reacts by crosslinking which group?

Explanation:
Formaldehyde fixation works by crosslinking amino groups on proteins. It first reacts with primary amines (NH2) to form a hydroxymethyl intermediate, and this can then form a methylene bridge between two amino groups, effectively linking proteins together. This is why the amino group is the primary target of formaldehyde in preserving tissue structure. Carboxyl, thiol, and phosphate groups don’t participate in the main crosslinking pattern seen with standard formalin fixation.

Formaldehyde fixation works by crosslinking amino groups on proteins. It first reacts with primary amines (NH2) to form a hydroxymethyl intermediate, and this can then form a methylene bridge between two amino groups, effectively linking proteins together. This is why the amino group is the primary target of formaldehyde in preserving tissue structure. Carboxyl, thiol, and phosphate groups don’t participate in the main crosslinking pattern seen with standard formalin fixation.

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