Syntax

PATCh $<$patch-statement$>$ END

is invoked from the main level of X-PLOR. The END statement activates the patching.

$<$patch-statement$>$:==

$<$residue-name$>$
{ REFErence=NIL $\vert<$patch-character$>$ =$<$selection$>$ } patches the specified selections of atoms using the patch residue with name residue name. The patch character corresponds to the first character in the PRES specification. The specification of NIL implies that in the PRESidue the patch characters are omitted. Multiple references are used to establish links to more than one residue.