A patient undergoing In Vitro Fertilisation (IVF) treatment is administered synthetic hormones. During the initial stage of the cycle, she receives daily injections to stimulate the development of multiple follicles in her ovaries. Once the follicles reach a sufficient size, she receives a single 'trigger injection' to induce the final maturation and release of the eggs (ovulation).

The graph below shows the relative concentrations of four hormones ($W$, $X$, $Y$, and $Z$) in the blood during a normal, untreated menstrual cycle.

Which two curves represent the hormones whose physiological roles are mimicked by these two stages of fertility treatment respectively?