Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
An initial part of a global alignment from GAP4 on two protein sequences (SwissProt accession nos Q9NTI2 and Q9Y2G3). A difference block is indicated by the plus sign +. Each column of the alignment is marked with one of the three letters: l, m and h, which indicates one of the three parameter sets used to score the column.
