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Positions of cysteine pairs with high propensity for cross-linking transmembrane helix 1 (TM1) and transmembrane helix 2 (TM2) of Tar. Initial (left) and revised (right) positions of TM2 relative to TM1 are diagrammed with cysteine pairs, showing high cross-linking propensities (Pakula and Simon 1992). Details and symbols as for Figure 3 ▶.
