func readSequence(r *fasta.Reader) (s seq.Sequence, err error) {
s, err = r.ReadSequence(translateA2M) // A2M encompasses FASTA/A3M
if !s.IsNull() {
return s, nil
}
if err == io.EOF {
return seq.Sequence{}, err
}
if err != nil {
return seq.Sequence{}, err
}
panic("unreachable")
}
