Abnormal base in tRNA is
The D Arm or DHU region is so named due to the presence of a dihydrouridine in that areaThe DHU arm serves as the recognition site for the enzyme which adds the amino acidRef: DM Vasudevan, 7th edition, page no: 597
Dihydrouracil
Orotic acid
Methyl Xanthine
Cystine
Metabolism of nucleic acids