For lineage tracing, RosaRFP reporter mice (https://www.jax.org/strain/007908) were used [43 (link)] and mated to Six3 HET and GnRHcre mice to create the Six3HET:RosaRFP:GnRHcre line. IHC was performed with the anti-RFP antibody (1:1000, Abcam, catalog number: ab62341, RRID: AB_945213).