  We investigate the exclusive electroproduction of pi^+ mesons from nucleons.
To leading twist, leading order alpha_s accuracy the corresponding production
amplitude can be decomposed into pseudovector and pseudoscalar parts. Both can
be expressed in terms of quark double distribution functions of the nucleon.
While the pseudovector contribution is connected to ordinary polarized quark
distributions, the pseudoscalar part can be related to one pion t-channel
exchange. We observe that the pseudovector part of the production amplitude is
important at x < 0.1. On the other hand, for 0.1 < x < 0.4 contributions from
one pion exchange dominate.
