about HIS residue

From: yxiong_at_mail.ccnu.edu.cn
Date: Fri Dec 19 2003 - 20:40:35 CST

Dear sir,
  I know I must use alias to modify HIS to HSD,HSE,HSP when I do a MD. However if
the system has many HIS residues, I want to modify some to HSD, others to HSE,
should I do to realize it?

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