Fig. 7. Model of Nrp1a-Sema3D-mediated guidance of left habenular axons.
(A) Sema3D attracts Nrp1a-expressing growth cones of left habenular
axons toward the dorsal IPN. Following Nrp1a (B) or Sema3D (C)
depletion, left habenular efferents innervate only the ventral IPN, similar to
right habenular neurons that do not express nrp1a. (D) Sema3D
overexpression can result in ectopic habenular projections that extend beyond
the dorsal IPN.