FIGURE 1.

Pigment arrangement and interaction strengths (in cm⁻¹) of a subunit of (A) LH4 and (B) LH2. The interaction strengths have been derived by a structure-based calculation that uses a point monopole approximation (Hartigan et al., 2002). The different angles of the B-α/B-β pigments of LH4 with respect to the B850-α/B850-β pigments of LH2 (see text for details) are readily observed. Also, the position of the B800-2 pigment in LH4 can be seen. The phytyl chains of the BChl a molecules are omitted for clarity.