Reviewed:

<bibtex>
    @MISC{ R-NUL-209448.1,
           author          = {Kalderon, D},
           title           = {Hedgehog pathway - Inferred Events},
           crossref        = {Reactome:R-NUL-209448.1},
           howpublished    = {\url{http://www.reactome.org/PathwayBrowser/#R-NUL-209448.1}},
           note            = {Reactome Pathway Knowledgebase, http://www.reactome.org/},
           month           = {March},
           year            = {2008},
           }
</bibtex>