Heat shock 10 kDa protein 1, also known as chaperonin 10 or early-pregnancy factor, is a protein that in humans is encoded by the HSPE1 gene. The homolog in E. coli is GroES that is a chaperonin which
gp31 co-chaperonin from bacteriophage t4
Following a surge of luteinizing hormone (LH), an oocyte (immature egg cell) will be released into the uterine tube, where it will then be available to be fertilized by a male's sperm within 12 hours. Ovulation marks the end of the follicular phase of the ovarian cycle, and the start of the luteal phase.