H3K9me2 resides on L1 and IAP elements in SSCs. (A-B) qPCR results from chromatin immunoprecipitation using an anti-H3K9me2 (black) and isotype control (grey) antibodies from spermatogonial stem cell lines. A schematic image describing L1 and IAP elements and the position of the primer sets used is depicted. Bars represent mean ± s.e.m. measured in triplicate from a representative experiment performed in two biological replicates.