title: Serum levels of proline imino-peptidase in normal adults and children.
abstract: Serum proline imino-peptidase activities in 98 normal individuals aged 1 month to 75 years are examined. Mean enzyme activity in sera of individuals ages less than 1 year is 66.6 U; 2 to 6 years; 46.2 U; 7 to 11 years, 52.8 U; 12 to 16 years, 48.8 U; 17 to 19 years, 34.1 U; 20 to 29 years, 28.8 U; 30 to 39 years, 30.5 U; 40 to 59 years, 35.6 U; and more than 60 years, 31.6 U. Serum enzyme activities were markedly elevated in infants aged less than 1 year, then decreased with age up to 20 years. Serum proline imino-peptidase activity in 44 normal adults aged 20 to 59 years ranged from 19.9 to 43.1 U and averaged 31.5 +/- 5.8 U. There is no statistical difference in serum activities in normal adults between males and females.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D000626:Aminopeptidases / Q000097:blood*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D011392:Proline; D012016:Reference Values
chemical_list: D011392:Proline; D000626:Aminopeptidases