Table 4. Database Resources for Cre Driver Data.

Database Name	URL	Number of cre records (19 April 2012)	Content
CrePortal	www.creportal.org	1,725	Symbol, synonym, name of the cre transgene or knock-in, MGI_ID, strain background, molecular construct, cre driver, inducibility, availability, sex, publications, anatomical structure/age specific expression, expression level/pattern, expression images (e.g. in-situ, immunohistochemistry), reporter
Cre-X	nagy.mshri.on.ca/cre_new	672	Strain background, cre driver, MGI_ID, inducibility, availability, initial publication, anatomical structure specific expression, expression pattern
CreZoo	bioit.fleming.gr/crezoo	174	Symbol, synonym, name of the cre transgene or knock-in, MGI_ID, strain background, cre driver, inducibility, availability, initial publication, anatomical structure/age specific expression
MouseCre	www.ics-mci.fr/mousecre/	38	Symbol, name of the cre transgene or knock-in, MGI_ID, strain background, molecular construct, cre driver, inducibility, availability, sex, publication, anatomical structure/age specific expression, expression images (e.g. in-situ, immunohistochemistry)
Create	www.creline.org	1,761*	Symbol, name of the cre transgene or knock-in, MGI_ID, strain background, cre driver, inducibility, IMSR, publication, anatomical structure for expression (system level and detail)
International Mouse Strain Resource	www.findmice.org	1,043	International catalog of mouse holdings at repositories worldwide; provides ‘index’ to all available cre lines with links to repository and MGI data on these cre lines.

^*This number represents a Biomart instance of data downloaded from CrePortal, Cre-X and CreZoo that has been analyzed for UNIQUE entries.