The X-band EPR spectra of Tyr radicals in different proteins. (A) P. denitrificans CcO+H2O2 (MacMillan et al., 1999); (B) horse metMb+H2O2 (Miki et al., 1989); (C) mouse TA3 cells RNR (Sahlin et al., 1987); (D) E. coli RNR (Hoganson and Babcock, 1992); (E) ovine PGHS, wide doublet (Kulmacz et al., 1990); (F) ovine PGHS, narrow singlet (Dorlet et al., 2002); (G) soybean metLb+H2O2 (Davies and Puppo, 1992); (H) S. typhimurium RNR (Allard et al., 1996); (I) A. thaliana photosystem II radical (Svistunenko et al., 2002); (J) metHb+H2O2 (Svistunenko et al., 2002); and (K) bovine catalase+peroxyacetic acid (Ivancich et al., 1996). The spectra were plotted on a common magnetic field axis as described in Software and Methods. The gridlines are drawn at a 20-Gauss interval.