Coding limits on the number of transcription factors

BMC Genomics

Table 2 Theoretical bounds for an n-length 4-letter code.

n	# code words – 4ⁿ/2	Coloring bound	Sphere packing bound
3	32	18	3
4	128	42	9
5	512	95	32
6	2,048	210	107
7	8,192	460	372
8	32,768	994	1310

The sphere packing bounds are from equation (10). The coloring bound is given by equation (8).

ISSN: 1471-2164