Dear Modeller,

My top file contains user-defined restraints involving hydrogen atoms.

When I add 'SET DO_LOOPS =1' to the top file, the modeller has the following error.

add_res_442E> One or more atoms absent from MODEL: O:381: HD1:381:

I guess this is related to that LOOPS optimizes nonhydrogen atoms. Is there a way around this problem?

Best regards, Han

Han Choe, PhD Department of Physiology University of Ulsan, College of Medicine Songpagoo Poongnapdong 388-1 Seoul 138-736, Korea