Anti-mouse proinsulin polyclonal antibody, also known as anti-insulin 1 C-peptide, is frequently used to study the structure, function and metabolism of insulin as well as proinsulin. The anti-insulin 1 C-peptide can also be used for immunocytochemistry and for immunohistochemical studies of paraffin-embedded or frozen tissue sections. Mouse proinsulin polyclonal antibody is generated in Guinea pig immunized with the KLH-conjugated mouse proinsulin peptide (71-84) [SPGDLQTLALEVAR].