The proteins are indicated by their gene names and abbreviated species names. Csp, caspase; PC, paracaspase; MC, metacaspase. Circles show nodes with 75% bootstrap support. Thick red lines indicate eukaryotic lineages. Species abbreviations on Figures 6.17–6.19 are: Af, Archaeoglobus fulgidus; Ap, Aeropyrum pernix; At, Arabidopsis thaliana; Atu, Agrobacterium tumefaciens; Bab, Brucella abortus; Bs, Bacillus subtilis; Bhen, Bartonella henselae; Ca, Clostridium acetobutylicum; Ccr, Caulobacter cresentus; Cel, C. elegans; Cj, Campylobacter jejuni; Ddis, Dictyostelium discoideum; Deha, Dehalococcoides sp.; Dm, Drosophila; Dre, zebrafish; Ec, Escherichia coli; Geos, Geosulfurococcus; Hbr, Hp, Helicobacter pylori; Hsa, human; Hvu, barley; Les, tomato; Lla, Lactococcus lactis; Lusi, jute; Mj, Methanococcus jannaschii; Mlo, Mesorhizobium loti; Mmu, mouse; Mta, Methanobacterium thermoautotrophicum; Mxan, Myxococcus xanthus; Ncr, Neurospora crassa; Osa, rice; Pae, P. aeruginosa; Pgin, Porphyromonas gingivalis; Ph, Pyrococcus horikoshii; Pput, Pseudomonas putida; Rhiz, Rhizobium sp.; Rp, Rickettsia prowazekii; Rsph, Rhodopseudomonas sphaeroides; Sce, yeast; Scoe, Streptomyces coelicolor; Spo, S. pombe; Sso, Sulfolobus sulfotaricus; Ssp, Synechocystis sp.; Sto, Sulfolobus tokodaii; Sme, Sinorhizobium meliloti; Ta, wheat; Tm, Thermotoga maritima; Tp, Treponema pallidum; Xfa, Xylella fastidiosa.