Cluster 1037: sgpt pyruvate glutamate transaminase serum normal upper limit uln iu Cluster 1620: pyruvate sgpt glutamate transaminase alt alanine uln aminotransferase upper limit Cluster 1872: pyruvate glutamate sgpt transaminase alanine alt aminotransferase upper normal serum Cluster 2123: sgpt purpose transaminase pyruvate uln glutamate alt alanine aminotransferase serum Cluster 2316: pyruvate sgpt glutamate transaminase alt alanine aminotransferase serum uln institutional