“…Within this region, we assayed the conserved decamer sequence (45,46) in several V promoters (V12P, V11P, V9P), the RSS elements flanking V segments (V13R, V12R, V11R, V9R, V6R), and several intergenic sites located between V segments. To assay DJ chromatin we analyzed a site in PD1 (47,48), just upstream of the D1 gene segment. Acetylation at these sites was compared with that of Oct-2 as a negative control not expressed in thymocytes (30), and to CD3⑀ as a positive control expressed at high levels in thymocytes.…”