// preprocessing at this stage involves, extracting a block sequence of the inputted sequence,
// presupposing the inputed peptide sequences are of variable lengths.
blockInputBGSeqs = jmxBSXr.extractBlockSequence(inputBGSeqs, configMap, db);
} else if(backgroundType.equalsIgnoreCase("database")){
//get all peptides about the specified central residue with the specified window
blockInputBGSeqs = jmxBSXr.extractBlockSeqs4rmDBWithMotifNCentralResidue(configMap, db);
} else if(backgroundType.equalsIgnoreCase("random")){
blockInputBGSeqs = jmxBSXr.extractRandomBlockSequences(configMap, db);
}
return blockInputBGSeqs;
}