load 1r4o hide all show cartoon, dna set cpk_radius, 0 select dna_o, (*.O? and dna); show spheres, dna_o; set cpk_radius, 50, dna_o; pause select dna_op, (*.OP? and dna); show spheres, dna_op; set cpk_radius, 50, dna_op; pause select dna_n, (*.N? and dna); show spheres, dna_n; set cpk_radius, 50, dna_n; pause