serine_threonine_turn st_turn_left_handed_type_two The peptide twists in an anticlockwise, left handed manner. The dihedral angles for this turn are: Residue(i): -140 degrees < chi(1) -120 degrees < -20 degrees, +80 degrees psi +120 degrees < +180 degrees, residue(i+1): +20 degrees < phi < +140 degrees, -40 < psi < +90 degrees. sequence BS:00232 st_turn_iil st turn left handed type two SO:0001143