Recognize rat C-peptide I and II, mouse C-peptide I. Not react with rat proinsulin. Best pairs for immunodetection (coating - conjugate): of rat C-peptides I and II - CII-29 - CC24, CII-55 - CC24, CII-97 - CC24; for rat C-peptide I only - 6H1 - CC24. Can be used for separate or consistent detection of rat C-peptide isoforms (rat C-peptide I and/or rat C-peptide II) in biological samples.