This family represents a conserved region of approximately 120 residues within eukaryotic Bicoid-interacting protein 3 (Bin3). Bin3, which shows similarity to a number of protein methyltransferases that modify RNA-binding proteins, interacts with Bicoid, which itself directs pattern formation in the early Drosophila embryo. The interaction might allow Bicoid to switch between its dual roles in transcription and translation [1]. Note that family members contain a conserved HLN motif.

1: Identification of drosophila bicoid-interacting proteins using a custom two-hybrid selection. Zhu W, Hanes SD; Gene 2000;245:329-339. PMID:10717484