Fig. 1
From: The nuclear 18S ribosomal DNAs of avian haemosporidian parasites
a Ribosomal units of multicellular eukaryotes and arrangement in ribosomal clusters (NTS: non-transcribed spacer, ETS: external transcribed spacer). b Arrangement of ribosomal units in Plasmodium species. The ribosomal units of Plasmodium spp. do not contain NTS and ETS regions and are not arranged in clusters with multiple units