TABLE 2.

ntn genes and their gene products

Gene	No. of bases in comparison	Position in sequence	Nucleotide identity with xyl homolog (%)	Amino acid identity of ORFb (%)	Mr of ORF (thousands)
ntnUa	48	1–48	100	100
ntnW	1,074	174–1220	99.6	99.1	36.9
ntnC	1,464	1252–2715	92.4	94.9	51.8
ntnM	1,110	2740–3849	84.1	86.2	41.6
ntnA	1,053	3999–5051	99.7	99.1	38.5
ntnB*a	699	5241–5940	95.6	97.4

^aIncomplete open reading frames. 

^bORF, open reading frame.