<prompt> The following are related to corpous luteum exceptLuteinised granulosa cells produce progesteroneEstrogen continues to be produced by the luteinised granulosa cellsLuteolysis is due to estrogen, PGF2a and endothelinThe peak steriod production is between 23 and 25th day  <response>: The estrogen attains a lower level and maintains a plateau curve as against a peak rise in follicular phase. Progesterone attains its highest peak about 8 days22nd day of menstual cycle after the LH peak Regression of corpus luteum is attrubuted to fall in LH level and rise in the level of estrogen and PGF2alpha. Ref: D.C. Duttas Textbook of Gynaecology, 6th edition, page no: 93 