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WELCH, R. A., MUTCHNICK, M. G., WELLER, F. E., & SOKOL, R. J. (1987). Maternal and Fetal Circulating Levels of Thymosin α1During Parturition. American Journal of Reproductive Immunology and Microbiology, 13(4), 125–127. doi:10.1111/j.1600-0897.1987.tb00108.x 
10.1111/j.1600-0897.1987.tb00108.x