Imprecise excision of the progenitor insertion, resulting in a 853bp deletion which removes both the first and second exons.
Inferred boundaries of an 853 bp deletion resulting from the imprecise excision of P{GT1}Brms1BG01329. The deletion starts at the insertion start and removes the first two exons of Brms1.
Brms1086-2 is rescued by Brms1+t3677