  In this talk various spin effects in hard exclusive electroproduction of
mesons are briefly reviewed and the data discussed in the light of recent
theoretical calculations within the frame work of the handbag approach. For
electroproduction of positively charged pions it is shown that there is a
strong contribution from photon-pion transitions which can be modeled by the
transversity GPD H_T accompanied by the twist-3 pion wave function.
