to investigate the interrelation between steroidogenic function of granulosa and theca lutein cells of the human corpus luteum , twelve corpora lutea of menstruation and pregnancy were divided into inner and outer layers , each of which was histologically confirmed to be composed of pure granulosa lutein cells ( gl ) or gl plus theca lutein cells ( tl ) , respectively .
C0010092
corpus luteum
C1135970
gl