these results are important because 1 ) they represent the first demonstration of prolactin or a prolactinlike substance in the sweat gland , 2 ) the prolactinlike material was localized to clear cells that are thought to be responsible for much of the fluid secretion , 3 ) the necessity for prolactin or pituitary extract in primary cultures of sweat gland epithelium is potentially explained , although not fully understood , and 4 ) it means that further studies concerned with the possible influence of prolactin on ion transport in the sweat gland are warranted .
C0229473
clear cells
C0014609
epithelium