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PLoS ONE 5 e11457 <a href=http://viagr.mom>viagra samples</a> Animals were scored as Normal if there was a single, symmetric vulval invagination; as Multivulval if they had at least one secondary invagination in addition to the main vulva; as weak Vulvaless if, instead of a fully formed vulval invagination, there were two small, equally sized invaginations separated by apparently undifferentiated tissue; as Vulvaless if there was no vulval invagination; and as Deformed if there was a single vulval invagination that was misshapen or asymmetric, or if the morphology was too abnormal to be confidently assigned to one of the other categories
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