Spontaneous neoplasms in amphibians

Spontaneous neoplasms in sheep with report of cases of melanoma, mesothelioma and lymphosarcoma

Spontaneous neoplasms in control Wistar rats: a comparison of reviews.

Spontaneous neoplasms in 930 control Wistar rats from five carcinogenicity bioassays conducted between 1990 and 1995 were reviewed and compared with review findings in studies between 1980 and 1990. Mean survival at 104 weeks was 55% for males and 60% for females, similar to that of the previous review. A total of 1599 neoplasms was diagnosed in 361 (78%) male and 415 (89%) female rats; 1293 (8...

Spontaneous development of neoplasms in severe combined immunodeficient mice

Severe combined immunodeficient (SCID) mice lack functional T and B cells. This renders them useful for implantation of human cells. The absence of immune cells, however, makes severe combined immunodeficient mice highly susceptible to infections and spontaneous development of malignancies; 2 of 114 CB17/Icr-Prkdc(scid) /IcrIcoCrl severe combined immunodeficient mice aged 9 and 10 months develo...

spontaneous neoplasms in sheep with report of cases of melanoma, mesothelioma and lymphosarcoma

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Sex Reversal in Amphibians.

Amphibians have been widely used to study developmental biology due to the fact that embryo development takes place independently of the maternal organism and that observations and experimental approaches are easy. Some amphibians like Xenopus became model organisms in this field. In the first part of this article, the differentiation of the gonads in amphibians and the mechanisms governing thi...