  We obtain simple expressions for tree-level maximally helicity violating
amplitudes of N gauge bosons from disk world-sheets of open superstrings. The
amplitudes are written in terms of (N-3)! hypergeometric integrals depending on
kinematic parameters, weighted by certain kinematic factors. The integrals are
transcendental in a strict sense defined in this work. The respective kinematic
factors can be succinctly written in terms of "dual" momentum twistors. The
amplitudes are computed by using the prescription proposed by Berkovits and
Maldacena.
