Detailed view of the target region for the primary QTL, including protein coding and RNA genes annotated in the Ensembl database (Ensembl 2006). Synonyms and/or Ensembl gene IDs for the protein coding genes are as follows: BRINP2, 6430517E21Rik, ENSMUSG00000004031; Astn1, ENSMUSG00000026587; PAPPA2, Creg1, ENSMUSG00000026732; 1600012P17Rik, ENSMUSG00000047661. 1600012P17Rik was identified from placenta cDNA. Other genes are described in the text.