Enables the building of new residues into the model and replacement of existing ones. BUILD menu block is encoded into MAIN source.
"START", "ATTACH", "INSERT" and "CHANGE" are setup flags. Their mode is indicated with radio buttons. Only one is active at a time.
No action is undertaken as long as "RESID ??" is not pressed. Keyboard input is in the origin window (mono-screen).
The BUILD menu block is encoded into MAIN source.
START indicates that a new segment will start at the current image center position.
ATTACH indicates that the newly created chain will be attached to thge last clicked residue - assuming that the residues are part of the same kind of biopolymer.
INSERT indicates that the new chain will start at the current image center position. However it will not be appended to the end of the atom records as by ATTACH, but INSERTED infront of the last clicked residue. A further CONNECT item click is needed to bring the chain to the desired place.
CHANGE means that the residue topology is supposed to be changed from the current one to the new one.
SEGMENT provides the segment name of the newly created segment. If not provided the segment name increases by "1" each time a new chain is generated.
CHAIN provides a new chain name and a sequence root. Sequence root is a string of characters to which numbers are added when sequence ID is generated.
"RESID ??" requires input from keyboard: a list of residue names. Each residue may be preceeded by an integer number of its repetitions( e.g. "3 ALA CYS 2 MET ...").