NCBI Bioinformatics Resources: An Introduction: BLAST: …
https://guides.lib.berkeley.edu/ncbi/blast
WebMar 21, 2024 · Tblastn is useful for finding homologous protein coding regions in unannotated nucleotide sequences such as expressed sequence tags (ESTs) and draft genome records (HTG), located in the BLAST databases est and htgs, respectively. ESTs are short, single-read cDNA sequences.
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