C8, C11, C7, and C18 were proximal to double‐positive T cells, representing thymic lymphoma characterised by elevated expression levels of genes like Notch1, Hes1 and Desi1,72, 73 along with markers associated with thymic T‐cell development such as Rag1/2, Xrcc6 and Dntt74 (Figures 2A and S6B). Here, DESI1 is linked to thymus lymphoma.