Organization of RAG1 in Mus musculus. Organization of RAG1 (based on Mus musculus, P15919 of http://www.uniprot.org/). The vertical line indicates the division in 5' and 3'-ends used in this paper. The analyzed zinc finger and DNA binding domains are indicated. Numbers indicate the amino acid positions in Mus musculus RAG1 sequence. "ZDD" indicates the zinc binding domain (which contains the zinc finger domain analyzed in this paper). "NBR" indicates the nonamer binding domain (which corresponds to the DNA binding domain analyzed in this paper). "Core region" indicates the region of the protein needed for cleavage activity (see  for additional information).