May be involved in gene regulation during development. Binds RNA. Expressed moderately during embryonic stages (0-18 hours) but then declines in late stage embryos (15-21 hours). Partially edited. RNA editing takes place in adult and creates an intron retention event that leads to a premature stop codon. The RNA edited version is called H8.3. A discistronic transcript of Sas10 and Rnp4F becomes an RNA duplex, which is a target for RNA-editing via Adar editase. Intron retention event in non-edited RNA. Intron excised in non-edited RNA.