Adenosine kinase (AK) (EC 2.7.1.20) (Adenosine 5'-phosphotransferase) (N6,N6-dimethyladenosine kinase) (EC 2.7.1.-) (N6-isopentenyladenosine kinase) (EC 2.7.1.-) (N6-methyladenosine kinase) (EC 2.7.1.-)