by means of a model based on the presence of one diploid nucleus per myocyte and per non-muscle cell , a nuclear dna content of 7.5 pg , and a constant ratio of dna content and sum of the lactate dehydrogenase isoenzymes ldh-4 and ldh-5 ( dna/ldh4+5 = 11.6 +/- 1.5 micrograms.u-1 ) in non-muscle cells , we calculated that in 21 neonatal rat heart cell cultures , cultured for 0-6 days , the number of muscle cells was 1.5 x 10 ( 6 ) per culture , independent of time ;
C0000702
a
C0012854
dna