define stem_acceptor 501-507,566-572
define stem_t 549-553, 561-565
define stem_d 510-512, 523-525
define stem_anticodon 538-544, 526-532

background white

select all
wireframe off
cpk off
cartoon off
backbone 100

select stem_acceptor
color blue

select stem_t
color yellow

select stem_d
color green

select stem_anticodon
color red

select not (stem_acceptor, stem_t, stem_d, stem_anticodon)
color grey