SSD: sterol-sensing direct.

@article{Levine2004SSDSD,
  title={SSD: sterol-sensing direct.},
  author={Tim P Levine},
  journal={Developmental cell},
  year={2004},
  volume={7 2},
  pages={152-3}
}
Cholesterol homeostasis is established by a complex of three proteins, one of which contains a hydrophobic domain previously termed a sterol-sensing domain. New biochemical studies of this domain demonstrate direct high-affinity binding of the sterol-sensing domain to sterol.