Abstract
Seven enzymes [NP (nucleoside phosphorylase); GOTM (mitochondrial glutamic oxaloacetate transaminase); PGM2 (phosphoglucomutase2); .alpha.FUC (.alpha.-fucosidase); PEP A (peptidase A); ADA (adenosine deaminase) and MPI (mannosephosphate isomerase)] which are found in the white cells of horses, including 39 British crossbred ponies and 16 crossbred horses, 30 Mongolian ponies and 10 Icelandic ponies, are described. Two of these enzymes - .alpha.FUC and MPI - were polymorphic in all populations studied and could be useful as additional markers in the paternity testing of horses. PEP A and GOTM were polymorphic in 2 of the populations studied and could also be used as genetic markers.

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