[Chimera-users] How to append functional groups to a residue

Hi Chimera Peoples - My question is how does one append a functional group (say, nitro, bromine, ..., or metal) to a residue (say, tyrosine, ..., adenine). This would involve replacing some atom or group. I am aware of 'swapa,' 'swapna' commands but these are straight forward one-for-one changes of whole residues. Thanks. C. Parry __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com