Table 2.

Frequencies of stem-loop structures predicted in M segment RNA.

			frequency(%)b
stem loop	nt positionsa	strand	human	swine	avian
SL3–10	219–240	–	99.6	98.9	99.5
		+	99.4	98.3	96.7
SL5–3B	967–994	–	97.1	94.9	98.7
		+	97.4	99	98.7
SL5–2	950–964	+	99.6	92	96.3

^aNucleotide positions refer to those of M segment +RNA in A/hvPR8/34(H1N1) (accession number: EF190977).

^bFrequency of entire stem-loop structures predicted in M segment RNAs of human (n = 443), swine (n = 172), and avian (n = 1,250) IAV strains.