SUMMARY Two substrains of the inbred mouse strain 101, maintained at Harwell and at Neuherberg, and designated 101/H and 101/E1, differed at five of the eight genetic loci tested and it seems very likely that one of these substrains has been genetically contaminated. The available evidence suggests that 101/E1 is probably the contaminated substrain.
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West et al. (1984) studied this question.