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Steroids in which an angular methyl group is missing; most commonly, the group between the A and B rings (C-19).
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Update on nandrolone and norsteroids: how endogenous or xenobiotic are these substances?
Other hypotheses are that some nutritional supplements contain traces of the steroids or prohormones, such as other norsteroids, not indicated on the label.
Responses for the three norsteroids were linear at 1-50 pg/mg, with correlation coefficients of 0.992-0.997.