When analysing the groups separately, in HD patients, observed species and phylogenetic diversity whole tree correlated negatively with age (r = −0.608, p = 0.016; r = −0.570, p = 0.027) and CRP (r = −0.660, p = 0.014; r = −0.569, p = 0.043) (Fig. 2). The gene discussed is CRP; the disease is Huntington disease.