Cai, K., Langen, R., Hubbell, W. L., & Khorana, H. G. (1997). Structure and function in rhodopsin: Topology of the C-terminal polypeptide chain in relation to the cytoplasmic loops. The National Academy of Sciences of the USA.

Cai, Kewen, Ralf Langen, Wayne L. Hubbell, und H. Gobind Khorana. Structure and Function in Rhodopsin: Topology of the C-terminal Polypeptide Chain in Relation to the Cytoplasmic loops. The National Academy of Sciences of the USA, 1997.

Cai, Kewen, Ralf Langen, Wayne L. Hubbell, und H. Gobind Khorana. Structure and Function in Rhodopsin: Topology of the C-terminal Polypeptide Chain in Relation to the Cytoplasmic loops. The National Academy of Sciences of the USA, 1997.