This genomic region was identified as a putative B cell regulatory element by FAIRE-seq (formaldehyde-assisted isolation of regulatory elements sequencing), and was validated as an enhancer by STARR-seq (self-transcribing active regulatory region sequencing) in lipopolysaccharide-activated mouse splenic B cells. A subregion was identified as a candidate cis-regulatory module (CRM) in developing mouse thymocytes based on a combination of DNase I hypersensitivity and transcription factor binding. That CRM was validated as an active enhancer by high-throughput CapStarr-seq reporter assays showing strong activity in P5424 T cells and weak activity in NIH3T3 fibroblasts. [provided by RefSeq, Oct 2023]