This enzyme is present in the serum of humans and higher primates.
References
^Lenney JF, George RP, Weiss AM, Kucera CM, Chan PW, Rinzler GS (August 1982). "Human serum carnosinase: characterization, distinction from cellular carnosinase, and activation by cadmium". Clinica Chimica Acta; International Journal of Clinical Chemistry. 123 (3): 221–31. doi:10.1016/0009-8981(82)90166-8. PMID7116644.
^Jackson MC, Kucera CM, Lenney JF (February 1991). "Purification and properties of human serum carnosinase". Clinica Chimica Acta; International Journal of Clinical Chemistry. 196 (2–3): 193–205. doi:10.1016/0009-8981(91)90073-L. PMID1903095.