Role in Molluscs
dpp is also found in molluscs, where it plays a key role in shell formation by controlling the shape of the conch. In bivalves, it is expressed until the protoconch has taken on the required shape, after which point its expression ceases. It is also associated with shell formation in gastropods, with an asymmetric distribution that may be associated with their coiling: shell growth appears to be inhibited where dpp is expressed.
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“So successful has been the camera’s role in beautifying the world that photographs, rather than the world, have become the standard of the beautiful.”
—Susan Sontag (b. 1933)