Read the given passage and answer the question below.
The reproductive cycle, in female primates, called the menstrual cycle, comprises 28 days in a healthy female. Primata is the order to which monkeys, apes and human beings belong. The duration of the menstrual cycle varies in different females as it is dependent upon a number of factors. However, the average duration amounts to around 28 days.
After ovulation, the Graafian follicle converts into _________.
[1 mark]