| Off Threshold: | The off target penalty threshold,
                    sgRNAs with potential off-target site carrying penalty score lower than the threshold will be eliminated.
                    For the detailed description of the scoring method, please check our paper. Briefly,
                    we suggest off threshold >= 20 for library design. In situations where more sgRNAs are desired,
                    the threshold can be decreased to 10, where the off-target effect of CRISPRi is still very slight as previously reported. | GC Content: | Min:  %
                    The minimal GC content of spacer region (percentage, positive integer between 0~100 is accepted). | Max:  %
                    The maximum GC content of spacer region (percentage, positive integer between 0~100 and > GC content Min is accepted). |