1.2kb deletion from -1.1kb to +152bp relative to the bip2 translation start codon, deleting the first exon harbouring the Histone Fold Domain. A w+mW.hs marker (originating from the pTV2-based donor construct) is also present.
lethal - all die before end of first instar larval stage
some die during first instar larval stage
bip23 mutants are late embryonic or first instar larval recessive lethal, without any obvious morphological defects.
