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Why the dog was ever considered as an appropriate animal for carcinogenicity testing is also not entirely clear... Despite the obvious problems of study design and interpretation, carcinogenicity tests in the dog, lasting 7 years, were requested by regulatory authorities from the late 1960s...One of the best known examples of the inappropriate use of the dog was the carcinogenicity testing of hormonal contraceptives. It is now understood that mammogenesis in the dog is very different from that in primates; quantitative and qualitative differences exist in the feedback control mechanisms, receptor content and behaviour, and target sensitivity and responsivity. As a result of this biological difference there was a high incidence of mammary tumours in long-term studies in dogs treated with progestagens/contraceptive steroids such as lynestrol. Ultimately pressure from the scientific community led, relatively recently, to the requirement for carcinogenicity studies in dogs being dropped.

+Fav | Go to Quote / Comment | Parkinson and Grasso |

Member Quotes About Receptor

Visha Poison acts as an antagonist at glycine receptors and paralyzes inhibitory neurons.

Go to Quote / Comment | Adil Raja |

Though we think of ourselves as singular, we are also communal, drawing from communal consciousness. The flip-side, we are also distracted by the hustling, the strife of a working day. At night they dream...we write!~ their sleeping dreams, fantasies our dawns for inspiration, tuneful-receptors-firing-poetic-alive.

Go to Quote / Comment | Joe Dimino |