“segment” selects atoms based on their assigned chain, which is a four-letter code.
segment segment-identifier-pattern
segi segment-identifier-pattern
s. segment-identifier-pattern
indicate segment 1HPV indicate segi ab* indicate s. liga+prot
A blank or undefined segment identifier is entered as two apostrophes.
segment ''
The macro equivalent is segment-identifier-pattern///.
indicate cpy1/// indicate seg1+seg3///