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I'm sure this is a dumb question, but here it is.  All the representations I can find of Adenine show C2 as only being bound to N1 and N3.  One of those is a single bond and the other is a double bond.  So 3 bonds.  Shouldn't it have 4 bonds?  So, why isn't C2 protonated in Adenosine?  If the answer is that there is a Hydrogen there, but Hydrogens are often omitted, then why don't canonical pairings of A-T have 3 hydrogen bonds.  The third one being between Adenosine's C2 Hydrogen and Thymidine's C2 Oxygen .   Thanks!

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