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Unique characteristics of the IGR IRES distinguish this genus. The aparavirus IGR IRES is classified as Type II and possesses an extra stem loop in Pseudoknot I that is absent in the Type I IGR IRES found in the cripaviruses and triatoviruses. Additionally, stem loop 2 of the Type II IGR IRES is shorter than in Type I. The insect-infecting members of genus Aparavirus have an additional, short ORF that overlaps the 5' end of the structural polyprotein ORF in the +1 reading frame. High divergence between the insect-infecting and crustacean-infecting members will likely result in revision of this genus.
See discussion under family properties
Sequence identity at the amino acid level between the capsid proteins of isolates and strains of a species is above 90%.
Apara: siglum derived from the type member of the genus, Acute bee paralysis virus.
Formica exsecta virus 1
Macrobrachium rosenbergii Taihu virus
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