DRAWNA - A PROGRAM FOR DRAWING SCHEMATIC VIEWS OF NUCLEIC-ACIDS

A program for drawing automatically exact and schematic views of nucle ic acids is described. The program is written in C ANSI and uses the S ilicon Graphics GL and Xirisw libraries within the X11/Motif environme nt. Through menus, the user can choose, specify, and manipulate in rea l time the three-dimensional views to be displayed. Drawing options in clude partitioning of structures into differently colored or shaped fr agments, representation of backbones as flat or with conic-section rib bons, display of paired or free bases as rods, and display of surfaces as filled or outlined and stereo or depth-cued views.