organism: Mus musculus
attributes.tag: source_name
attributes.value: Pro-B cell
attributes.tag: strain
attributes.value: C57BL/6
attributes.tag: genotype
attributes.value: Rag1(cre/cre)
attributes.tag: cell preparation
attributes.value: Ex-vivo, FACS-sorted
attributes.tag: cell sorting strategy
attributes.value: (CD19+ B220+ IgM- IgD- ckit+)
attributes.tag: chip antibody
attributes.value: H3K27me3 (Cell Signaling Technology C36B11)