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Hey, I hope you are well? I'm not confusing you again! But be careful, we can also distinguish between progenitor and precursor, we can then say that the lymphoid progenitor gives the lymphoid precursor in the bone marrow, the precursor will then go to the thymus to give a prothymocyte. Generally we don't make a big deal about all these little details (but it's good to know all that anyway!) Good luck with your revisions! 0:00 intro 0:56 The thymus 1:48 Differentiation of the lymphoid progenitor in the thymus (cortex, medulla, cortico-medullary junction) 3:06 Choice of lineage and rearrangement of TCR genes (NKT, LTγδ, LTα𝜷) 4:15 Positive selection 5:11 Negative selection 6:20 Let's recap (Summary) Subscribe to my Facebook channel: / be-insanely-productive-bip-106333918057830 Source Info: -[http://lvts.fr/Pages_html/Encyclopedi... Immuno/Chapitre 4.htm](http://lvts.fr/Pages_html/Encyclopedi...) -[https://www.cours-pharmacie.com/immun...](https://www.cours-pharmacie.com/immun...) -wikipidia -Armando hasundugan -Ninja nerd science