In the last episode of this season’s BioSounds. We have Chloé Mayere telling us about her PhD project on creating a robust model for the development of gonads, which plays crucial roles in the biological process of sex determination. And then together with Camila Branco, we will learn from Prof. Paula Nunes-Hasler about the mechanism of antigen cross presentation, an essential mechanism of our immune system. Presented by Jiabin Xu.