from http://eyebrowse.cit.nih.gov/goldenPath/help/blatSpec.html

matches int unsigned , # Number of bases that match that aren’t repeats
misMatches int unsigned , # Number of bases that don’t match
repMatches int unsigned , # Number of bases that match but are part of repeats
nCount int unsigned , # Number of ‘N’ bases
qNumInsert int unsigned , # Number of inserts in query
qBaseInsert int unsigned , # Number of bases inserted in query
tNumInsert int unsigned , # Number of inserts in target
tBaseInsert int unsigned , # Number of bases inserted in target
strand char(2) , # + or - for query strand, optionally followed by + or – for target strand
qName varchar(255) , # Query sequence name
qSize int unsigned , # Query sequence size
qStart int unsigned , # Alignment start position in query
qEnd int unsigned , # Alignment end position in query
tName varchar(255) , # Target sequence name
tSize int unsigned , # Target sequence size
tStart int unsigned , # Alignment start position in target
tEnd int unsigned , # Alignment end position in target
blockCount int unsigned , # Number of blocks in alignment
blockSizes longblob , # Size of each block in a comma separated list
qStarts longblob , # Start of each block in query in a comma separated list
tStarts longblob , # Start of each block in target in a comma separated list