Regulator of alternative splicing that specifically recognizes and binds N6-methyladenosine (m6A)-containing RNAs (PubMed:27919077, PubMed:27919081, PubMed:28675155). Acts by acting as a reader of m6A methylation (PubMed:27919077, PubMed:27919081). Required for sex determination and dosage compensation via Sxl alternative splicing: m6A methylation acts as a key regulator of Sxl pre-mRNA and promotes female-specific alternative splicing of Sxl, which determines female physiognomy (PubMed:27919077, PubMed:27919081, PubMed:28675155). M6A methylation is also required for neuronal functions (PubMed:27919077). Mutant flies survive until adulthood but exhibit flight defects and poor locomotion (PubMed:27919077, PubMed:27919081, PubMed:28675155). Flies display sexual transformations dues to Sxl splicing defects (PubMed:27919081, PubMed:28675155). Contaminating sequence.