Table 2.

Decisive sites favoring topology T2 vs. T3 in the exposed and buried residues ^a.

Site Class	Ctenophore Sister (T2)	Ctenophore + Porifera (T3)
Exposed	172	150
Buried	167	205

^a T2 and T3 refer to the arrangement of ctenophores, sponges, and remaining metazoa (Figure 1); other relationships were held constant.