Abstract
Extracts from preparations of partially purified Anaplasma marginale revealed low levels of lactate dehydrogenase (LDH). Enzyme inhibition by immune sera further indicated that A. marginale possesses a protein moiety the same as that of the normal red blood cell (RBC), although data suggested an alteration of LDH1 from that observed in normal RBC. Bimodal isozyme distribution was detected after electrophoresis of the extracts. One isozyme approached the cathode and the other the anode, and both appeared to be nicotinamide adenine dinucleotide-dependent. Heterogeneity of parasite and host cell isozymes was established on the basis of zone electrophoresis on cellulose acetate strips.
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