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. 2019 Feb 14;11(2):116. doi: 10.3390/toxins11020116

Figure 4.

Figure 4

Phylogenic tree relating the venom phospholipase A2 activities of 15 cobra species by subgenera. Blue: acidimetric assay; red: colorimetic assay. The venom PLA2 activity is expressed in a ratio relative to the highest activity detected by acidimetric or colorimetric assay in this study (1.0 implies the highest activity). More intense color indicates higher PLA2 activity. The phylogenetic tree was redrawn with adaptation from phylogenetics of cobras [32]. Naja sumatrana is depicted here as a sister taxon of Naja sputatrix. Spitting cobras are marked with the snake symbol next to their species name.