Abstract
Serum growth-promoting activity measured upon lymphocytes, sulfation activity and radioimmunoassayable somatomedin C (Sm-C) levels were measured in sera from women during the menstrual cycle. The data showed that: estradiol, progesterone, LH or FSH added in vitro do not increase the 3H-thymidine uptake into lymphocytes; the serum thymidine activity decreases during the luteal stage of the cycle, and is negatively correlated with the progesterone levels; the sulfation factor and Sm-C levels do not have significant variations during the menstrual cycle, and the GH maximum values are attained during the luteal stage.
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