Fig. 1 in Barcoding diatoms: evaluation of the V4 subregion on the 18S rRNA gene, including new primers and protocols

Fig. 1 Consensus secondary structure of the 18S locus (SSU rRNA gene) in diatoms (181 sequences), based on the Toxarium undulatum 18S secondary structure model as reference sequence. Upper-case letters indicate that nucleotides at corresponding positions are conserved in 98– 100% of sequences, lower-case letters indicate 90–98% conservation, dots 80–90% conservation, circles indicate greater than 20% variability.