. "The establishment, maintenance and elaboration of the dorsal/ventral axis. The dorsal/ventral axis is defined by a line that runs orthogonal to both the anterior/posterior and left/right axes. The dorsal end is defined by the upper or back side of an organism. The ventral end is defined by the lower or front side of an organism." . . . "dorsal/ventral axis specification" . "dorsal-ventral axis specification" . "dorsal/ventral axis determination" . "dorsoventral axis specification" . . . . . . . .