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IV Q-Filter: A quality filter system of influenza virus nucleotide sequences.
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Aim: Since most of the nucleotide sequences in public databases are from direct submission, they are not very consistent. The sequences are either incomplete or with some annotation errors. Since the data quality is of crucial importance for successive data analysis, there is a growing need to corroborate the data in order to analyze them effectively. The IV Q-Filter is developed to classify and rank the IV data into 7 categories according to sequence consistency: C1-C4 and P1-P3, as illustrated below.
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C1: Complete CDS 
Example: Accession Number AB027494
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C2: 5'UTR+complete CDS 
Example: Accession Number AJ404627
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C3: 3'UTR+complete CDS 
Example: Accession Number AB212649
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C4: 5'UTR+complete CDS+3'UTR 
Example: Accession Number AX350198
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P1: Partial CDS 
Example: Accession Number AY590561
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P2: 5'UTR+partial CDS 
Example: Accession Number K01023
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P3: 3'UTR+partial CDS 
Example: Accession Number K00961
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If a nucleotide sequence contains multiple CDS regions, each of these regions will be evaluated separately. The classification of the whole sequence will be combination of all its sub-region categories.
Example: Accession Number DQ107515 will be classified as P3,P1 because its first CDS region belongs to P3 category and its second CDS region belongs to P1.
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UTR Search and Download:
This section offer UTR search and download and the search condition is the same as the Main Search.
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