Table 1. Breakdown of the Gram-negative bacterial protein benchmark dataset taken from [11].

Subset	Subcellular location	Number of proteins
	Cell inner membrane	557
	Cell outer membrane	124
	Cytoplasm	410
	Extracellular	133
	Fimbrium	32
	Flagellum	12
	Nucleoid	8
	Periplasm	180
Total number of locative proteins		1,456a
Total number of different proteins		1,392b

None of proteins included here has sequence identity to any other in a same subcellular location.

^aSee Eqs.36–38 of [2] for the definition about the number of locative proteins, and its relation with the number of different proteins.

^bOf the 1,392 different proteins, 1,328 have one subcellular location, 64 have two locations, and none have three or more locations.