Alteration of Neutrophil Reactive Oxygen Species Production by Extracts of Devil’s Claw (Harpagophytum)

Figure 2

Principal component analysis showing ISSR and RAPD marker-based similarity between 24 Harpagophytum accessions used in the DNA and neutrophil study (the 6 accessions within circles). Samples are plotted on the first two components, explaining 29 and 13% of the total variation, respectively. The numbers indicate accession codes, whereas the symbols for the taxa are abbreviated as follows: PP: H. procumbens ssp. procumbens; PT: H. procumbens ssp. transvaalense; PN: putative new variety of H. procumbens ssp. transvaalense; ZS: H. zeyheri ssp. sublobatum; ZZ: H. zeyheri ssp. zeyheri; HH: putative interspecific hybrids (between H. procumbens and H. zeyheri).