Recognize both C-peptides I and II (rat and mouse). Low affinity to rat proinsulin. Best pairs for rat C-peptides I and II immunodetection (coating - conjugate): CII-29 - CC24, CC27 - CII-29. 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.