The amino acid sequences below represent the sequences of transmembrane helices. The characteristics of a helices that form a channel are different from those that form a single transmembrane domain. Select the helix that forms a single transmembrane domain.

The amino acid sequences below represent the sequences of transmembrane helices. The characteristics of a helices that form a channel are different from those that form a single transmembrane domain. Select the helix that forms a single transmembrane domain.




(a) VGHSLSIFTLVISLGIFVFF
(b) IMIVLVMLLNIGLAILFVHF
(c) ILHFFHQYMMACNYFWMLCE
(d) VTLHKNMFLTYILNSMIIII



Answer: 




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