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The function of nucleolus organizer (NO) is to form a nucleolar body where the ribosomal RNAs are synthesized and processed (Perry 1962; Chipchase and Birnstiel 1963) . Recent in situ DNA-RNA hybridization techniques have located ribosomal cistrons at NO (Pardue et al. 1970, 1973; Henderson et al. 1972; Pardue and Gall 1972), and hence, the exclusive existence of certain structural non-histone proteins (termed "N band") at the NO region is of particular significance (Matsui and Sasaki 1973a;

NUCLEOLUS ORGANIZER OF <i>VICIA FABA</i> CHROMOSOMES REVEALED BY THE N BANDING TECHNIQUE