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Fos-LI (black dots) in coronal sections of the SON of rats infused with relaxin (25 μg/h, i.v.). (A) Normal rat. (B) Rat in which the OVLT had been totally ablated. (C) Rat infused with vehicle. (D) Rat with the SFO ablated. (E and F) The supraoptic nuclei from a rat with a unilateral right-sided lesion in the tissue lateral to the OVLT showing more Fos-LI in the left (E) than right (F) SON. Boundaries of the SON are indicated.
