The URLs module contains no classes or functions but simply assign extra URL patterns to the urlpatterns variable:
urlpatterns = patterns('',
# search pattern
url(r'^search/$', views.search, name="search"),
# gene specific patterns
url(r'^geneSingle/(\d+)/$', views.geneSingle, name="geneSingle"),
# target specific patterns
url(r'^targetSingle/(\d+)/$', views.targetSingle, name="targetSingle"),
# reagent specific patterns
url(r'^reagentSingle/(\d+)/$', views.reagentSingle, name="reagentSingle"),
# imageSet specific patterns
url(r'^imageSetSingle/(\d+)/$', views.imageSetSingle, name="imageSetSingle"),
# experiment specific patterns
url(r'^experimentSingle/(\d+)/$', views.experimentSingle, name="experimentSingle"),
url(r'^experimentsAll/$', views.experimentsAll, name="experimentsAll"),
url(r'^experimentDownload/(\d+)$', views.experimentDownload, name="experimentDownload"),
# phenotype specific patterns
url(r'^phenotypeToGene/(\d+)/$', views.phenotypeToGene, name="phenotypeToGene"),
url(r'^phenotypeToReagent/(\d+)/$', views.phenotypeToReagent, name="phenotypeToReagent"),
url(r'^phenotypeGeneLinkage/(\d+)/(\d+)$', views.phenotypeGeneLinkage, name="phenotypeGeneLinkage"),
)