the culture of nil hamster fibroblasts in mem lacking nicotinamide ( nam-mem ) leads to : ( 1 ) the rapid loss of intracellular total nicotinamide adenine dinucleotide ( nad ( h ) ) content in these cells from a level of 150-200 pmoles/10 ( 5 ) cells to less than 20 pmoles/10 ( 5 ) cells ;
C0016030
fibroblasts
C0007634
cells