Expression of lactic dehydrogenase isoenzymes in rabbit muscle during development.

1. Rabbit cDNA probes for H and M lactic dehydrogenase subunits were used to monitor mRNA levels in different muscle types during growth. 2. At the same time, lactic dehydrogenase activity and relative quantities of H and M protein subunits were measured. 3. The main results are that mRNA abundance depends on muscle type and age, and mRNA abundance is not correlated with enzymatic activity.