data from a hypogammaglobulinemic infant revealed a persistently low ecto-5'-nucleotidase activity over a 10-mo period until at 14 mo of age the activity was 8.8 nmol/hr/10 ( 6 ) cells in total lymphocytes and 13.0 nmol/hr/10 ( 6 ) cells in b cells , which correlated with in vivo and in vitro evidence of delayed b cell maturation .
C0007634
cells
C1511002
b cell maturation