Table 1. Archaea-Bacteria (AB) branch lengths and AB branch lengths as a proportion of total tree length inferred from ribosomal and non-ribosomal concatenates are similar.

The data do not support a faster evolutionary rate for ribosomal proteins on the AB branch compared to other kinds of ancient proteins.

	AB branch length		Total tree length		AB branch length as a proportion of total tree length
	Ribosomal	Non-ribosomal	Ribosomal	Non-ribosomal	Ribosomal	Non-ribosomal
27 marker set	1.9541	3.7723	250.7255	239.8203	0.0078	0.0157
54 marker set	1.8647	2.5414	271.3327	288.8470	0.0069	0.0088