BMA-HPO-31 protein; contains similarity to Pfam domains PF01743 (Poly A polymerase head domain), PF12627 (Probable RNA and SrmB- binding site of polymerase A); contains similarity to Interpro domains IPR002646 (Poly A polymerase, head domain), IPR043519 (Nucleotidyltransferase superfamily), IPR032828 (tRNA nucleotidyltransferase/poly(A) polymerase, RNA and SrmB- binding domain)