Ovaries were placed in 10% buffered formalin and paraffin embedded. Following routine processing, 6-lm thick sections were placed on polylysine-treated slides and stained using a polyclonal
rabbit antihuman STC 1 antiserum well characterized in terms of its specificity for STC 1 and previously validated in the swine according to the method described in slightly modified. Briefly, sections were blocked in 10% normal swine serum for 20 min and then the primary antibody was applied (1:1000 dilution) and incubated overnight at 4 °C. At the end of incubation, slides were washed in PBS and then incubated with biotinylated secondary antibody for 15 min. After three 5-min washes in PBS, a complex of streptavidin–peroxidase (LSABÒ + SYSTEM-HRP, Dako, Glostrup,was applied for 15 min. Positive reactions were revealed by AEC
.Sections were then washed three times for 5 min with PBS and then counterstained with Gill’s hematoxylin for 2 min. Control sections were subjected to the same procedure, except that diluted swine serum replaced the first antibody