title: how comparing PQG with PEG and PQA in Blast Algorithm?
body: <p>In BLAST algorithm with seed stage 
     the score obtained by comparing PQG with PEG and PQA is 15 and 12, respectively. 
   I dont' understand this . can any body explain with example how  comparing PQG with PEG and PQA is 15 ?
    it is very important </p>