Figure 1.

Sequence alignment of uncleaved low pathogenic H5N2 HA USDA and high pathogenic H5N1 HA Qinghai (QH). Amnio acids implicated in cleavage of HA0 into HA1 and HA2 are highlighted in red.

Rumschlag-Booms et al. Virology Journal 2009 6:76   doi:10.1186/1743-422X-6-76
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