TABLE 2.

Structure of 5′- and 3′-end NTRs and three ORFs of astroviruses

Virusa	No. of nucleotides in:
	5′ NTR	ORF 1a	ORF 1a–1b overlap	ORF 1b	ORF 1b–2 overlap	ORF 2	3′ NTR	Total
ANV	13	3,027	10	1,530	77	2,148	305	6,927
HAst 1	85	2,889	70	1,557	221	2,574	80	6,813
HAst 2	82	2,841	70	1,557	113	2,496	82	6,797

^aANV, AB033998; HAst, 1 Z25771; HAst 2, L13745.