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Which of the following is not a variant of BLAST?

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Which of the following is not a variant of BLAST?

(a) BLASTN

(b) BLASTP

(c) BLASTX

(d) TBLASTNX

I have been asked this question in an online interview.

My question is taken from Basic Local Alignment Search Tool (BLAST) topic in section Database Similarity Searching of Bioinformatics

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Correct answer is (d) TBLASTNX

Explanation: BLAST is a family of programs that includes BLASTN, BLASTP, BLASTX TBLASTN, and TBLASTX. BLASTN queries nucleotide sequences with a nucleotide sequence database. The alignment scoring is based on the BLOSUM62 matrix.

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