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Generalized secondary structure model for the 28S rRNA based on individual secondary structure models of nematode species listed in Table 1. Helices are numbered according to Wuyts et al. (2001) and Chilton et al. (2003). Twelve D domains (expansion segments) are defined according to Ellis et al. (1986) and Chilton et al. (2003). Shaded areas mark nucleotide positions excluded in the ProAlign progressive posterior-probability-filtered alignment. Continued on Figure 3.
