Sheth A R, Vaidya R A, Raiker R S
Fertil Steril. 1976 Apr;27(4):397-8. doi: 10.1016/s0015-0282(16)41775-9.
The presence of prolactin in human cervical mucus was demonstrated by radioimmunoassay. The levels of prolactin in cervical mucus were significantly higher (260 ng/ml +/- 47.5 SE) than those in sera of normally menstruating women (30.28 ng/ml +/- 2.0 SE).