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Orientation of the phenoxyl group of Y
in
PS II from S. elongatus with respect to the membrane normal
(parallel to the C2 symmetry axis), as derived
from the single crystal EPR spectra. The angle α = 84° is
between the gy direction and the membrane normal
n; β = 26° is the tilt of the phenoxyl ring plane
with respect to n. Work on oriented membrane fragments from
spinach yielded α = 74° and β = 26° (25).
