Genetic interactions suggest that Danforth's short tail (Sd) is a gain-of-function mutation.

Abstract excerpt

Danforth's short tail (Sd) is a semidominant mutation on mouse chromosome 2 that acts cell autonomously in the notochord and leads to its distintegration, and thus causes severe defects in somite patterning and vertebral column development. The molecular nature of the Sd gene and mutation is unknown, and it is unclear whether Sd is a loss-of-function mutation and the semidominant inheritance of the Sd phenotype...

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