Extended Data Fig. 4: Principal component analysis for SLC6A16 (ranked 2nd) and two other genes (MGAM, HPS5) above the 99th percentile of ƒd empirical distribution (related to Fig. 3).

PCA based on sampling of a single read at each site. North African red foxes individuals (n = 30) unambiguously cluster closer to Rueppell’s (n = 24) than other red foxes (n = 18). Arrow highlights hidden North African red fox individuals clustering within Rueppell’s fox (MGAM). See also Figure S9 for gene tree topologies.