text:  LuRKO d19 testis + testosterone, 24h post injection - 25ugA Testis, LH receptor knockout, dose/response to testosterone treatment given at 19 days post partum, assayed 24h post injection genotype/variation: LuRKO; tissue: testis; age post partum: 19 days + 24 hrs; testosterone dose: 25ug; time post testosterone injection: 24 hrs