Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0014579304003333
	free resource	Mouse Genome Informatics (MGI)	http://www.informatics.jax.org/reference/15094058
	free resource	Wiley	https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0014-5793&date=2004&volume=564&issue=1-2&spage=153