Ppm1g^tm1Dgen

将细菌的lacZ基因插入，使其由内源性基因驱动β-半乳糖苷酶的表达。这种等位基因的β-半乳糖苷酶表达在所有检查的器官中均可检测到。 (Source: The inserted bacterial lacZ gene was integrated with the native promoter, driving expression of beta-galactosidase, and its expression could be detected in all examined organs.)