Abstract
Mullerian Inhibiting Substance, a fetal testicular hormone found in most mammalian species, causes regression in the male of the Mullerian duct, the anlagen of the fallopian tube, uterus, and upper vagina. Limitations to study of this substance in the past have been posed by its short period of production and by its localized and specific action. We have been able to store testicular fragments that continue to demonstrate detectable Mullerian Inhibiting Substance activity for up to 5 months by using techniques of slow freezing which approximate 1 °C/min, cryoprotective additives, storage in liquid nitrogen, and rapid thawing. These fragments then can be pooled for biochemical and endocrinological studies. In addition, unknown fragments can be transported long distances for assay of Mullerian Inhibiting Substance.
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