RNA Internal Loops with Tandem AG Pairs: The Structure of the 5′G AG U/3′U GA G Loop Can Be Dramatically Different from Others, Including 5′A AG U/3′U GA A

RNA Internal Loops with Tandem AG Pairs: The Structure of the 5′G AG U/3′U GA G Loop Can Be Dramatically Different from Others, Including 5′A AG U/3′U GA A