Addaa adds an amino acid of type residue_type with sequence number residue_number in the specified conformation after the specified preceding_residue. Conformation may be ext (extended, the default), alpha (alpha helix), pbeta (parallel beta sheet), or abeta (antiparallel beta sheet).
Residue must be the last residue of a chain. The temperature factor for the new residue is set to the highest currently found in the model.
Example:
addaa tyr,30 #0:29- add tyrosine in extended conformation as residue 30, after residue #0:29