TABLE 4.

Polymorphic codons predicting amino acid replacements among flagellin (fliC) sequences of four H types

H type	Amino acid and codon in multiple-sequence alignment at codon positiona:
	71	271	289	299	317	355	376	410	412	415	449	450	496	546	602
	Gly	Glu	Ser	Leu	Lys	Lys	Asp	Lys	Ala	Asp	Lys	Ala	Thr	Ser	Gly
H2	GGT	GAA	AGT	TTG	AAA	AAA	GAT	AAA	GCT	GAC	AAA	GCT	ACG	TCT	GGC
			Ile	Val											Leu
H21	—	—	ATT	GTG	—	—	—	—	—	—	—	—	—	—	CTG
	Ala	Ala		Val		Lys			Val					Pro	Leu
H12	GCT	GCA	—	GTG	—	AAG	—	—	GTT	—	—	—	—	CCT	CTG
		Ala		Val	Glu	Asn	Gly	Thr	Val	Asn	Asn	Thr	Ser	Ser	Leu
H1	—	GCA	—	GTG	GAA	AAT	GGT	ACA	GTT	AAC	AAT	ACT	TCG	TCA	CTG

^aA dash means that the codon is identical to that in the H2 sequence. Boldface type indicates that the amino acid differs from that in the H2 sequence. Nucleotides that differ are underlined.