Identifying Homologous Sequences

BLASTn (Basic Local Alignment Search Tool) is a database that compares your nucleotide sequence to all other nucleotide sequences in the NCBI database and then identifies sequences that share regions of homology with your sequence. Comparing sequence homology with related genes in the same family allows you to investigate how genes evolve over time.

Click on the link below to obtain the beta-globin sequence you will using to perform a BlastN search. When the screen opens, first select the "Select All" and then "Copy" commands under the Edit menu. Then use your browsers back button to return to the Clustal W search page. Use the "Paste" option under the edit menu to paste the beta-globin sequence into the search box.

Click on the link below to access BLASTn

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