This family contains a presumed domain that is about 100 amino acids long. All members of this family contain a conserved CLPQ motif. The c-ski proto-oncogene has been shown to influence proliferation, morphological transformation and myogenic differentiation. Sno, a Ski proto-oncogene homolog, is expressed in two isoforms and plays a role in the response to proliferation stimuli. Dachshund also contains this domain. It is involved in various aspects of development.