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X-band Davies-pulsed ENDOR spectrum of Y
in frozen solution of PS II cc from S. elongatus. Principal
values of the obtained hyperfine coupling tensors are labeled by
numbers (see text). Experimental parameters: T = 5 K,
RF pulse length 8 μs, 64/128 ns microwave pulses,
νmw = 9.7 GHz, proton Larmor frequency,
νH = 14.8 MHz.
