Isoschizomer

Isoschizomers are pairs of restriction enzymes specific to the same recognition sequence and cut in the same location. For example, Sph I (CGTAC^G) and Bbu I (CGTAC^G) are isoschizomers of each other. The first enzyme to recognize and cut a given sequence is known as the prototype, all subsequent enzymes that recognize and cut that sequence are isoschizomers. Isoschizomers are isolated from different strains of bacteria and therefore may require different reaction conditions.

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An enzyme that recognizes the same sequence but cuts it differently is a neoschizomer. Isoschizomers are a specific type (subset) of neoschizomers. For example, Sma I (GGG^CCC) and Xma I (G^GGCCC) are neoschizomers (not isoschizomers) of each other.

An enzyme that recognizes slightly different sequnce, but produces the same ends is a isocaudomer.