we produced three batches of a human-serum-based enzyme reference material ( erm ) enriched with human aspartate aminotransferase ( ec 2.6.1.1 ) , alanine aminotransferase ( ec 2.6.1.2 ) , creatine kinase ( ec 2.7.3.2 ) , and lactate dehydrogenase ( ec 1.1.1.27 ) .
C0030016
ec
C0022917
lactate