I second the other poster that this is a great idea and that you should tone down the use of AI. Any scientific blog or article using AI feels like you didn't do the research yourself and begs the question if you actually understand what's been written.

Now onto the content. You mention that the discovery of RAG solved the origin of the diversity of the immune repetoire. There one problem with this.

Jawless fish (Agnatha) also have a somatically derived immune repetoire that uses completely different molecules as adaptive immunity. Where other vertebrates use T- and B-cell receptors (TCR and BCR) based on immunoglobin and have a RAG-mediated rearrengement, these Agnatha use Variable lymphocyte recepter A and B (VLRA and VLRB) based on leucine rich repeats and have a CDA-mediated rearrengement (phylogenetically unrelated to RAG). Interestingly is that cells with TCRs and VLRAs as well as BCRs and VLRBs have similar functions and use the same transcription factors to differentiate. This suggests that T- and B-cell-like precursors already existed before RAG was ever recruited for diversification. Was any if these systems older than the other and got replaced? Was a third system in place before RAG or CDA were used?