MeSH definition : An estrogenic steroid produced by HORSES. It has a total of five double bonds in the
A- and B-ring. High concentration of equilenin is found in the URINE of pregnant mares.;
An estrogenic steroid produced by HORSES. It has a total of five double bonds in the
A- and B-ring. High concentration of equilenin is found in the URINE of pregnant mares.