These column names are displayed when columns is called on a
SIFTDb object.
RSID : rsid
PROTEINID : NCBI RefSeq protein ID
AACHANGE : amino acid substitution; reference aa is preceeding,
followed by the position and finally the snp aa
METHOD : method of obtaining related sequences using PSI-BLAST
AA : either the reference or snp residue amino acid
PREDICTION : SIFT prediction
SCORE : SIFT score (range 0 to 1)
TOLERATED : score is greater than 0.05
DAMAGING : score is less than or equal to 0.05
NOT SCORED : no prediction is made if there are less than
2 homologous sequences that have an amino acid
at the position of the given SNP or if the SIFT
prediction is not available
MEDIAN : diversity measurement of the sequences used for
prediction (range 0 to 4.32)
POSITIONSEQS : number of sequences with an amino acide at the
position of prediction
TOTALSEQS : total number of sequences in alignment
providing 
.