activities of two key glycolytic enzymes ( pyruvate kinase ( pyki ) and phosphofructokinase ( pfk ) ) were measured in two tumor cell lines ( fibrosarcoma ( fs ) and hela ) and two normal cell lines ( rat lung fibroblasts ( rlf ) and wi-38 ) maintained in culture for up to 96 hours under aerobic ( po2 approximately 140 ) and hypoxic po2 approximately 15 ) conditions .
C0016057
fibrosarcoma
C0016030
fibroblasts