The biological functions and reaction pathways of lipocalins in mammalian system were sought. Mouse uterine 24p3 protein is a secreted lipocalin from mouse uterus and it was human NGAL homologus protein. To evaluate the effect of uterine 24p3 protein on the reproductive system, human endometrial carcinoma cell line (RL95-2) was an experimental target for achieving the in vitro study. The cells were treated with 0.75