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The number of cycles for library amplification depends on the amount of input dsDNA as well as your downstream application.
For PCR-amplified libraries, such as those used in whole genome sequencing (WGS) applications, the minimum recommended number of PCR cycles for different dsDNA input amounts is outlined below (expected yield is ~4 nM final library):
If the constructed libraries will be subsequently used for hybridization enrichment, the minimum recommended number of PCR cycles for different dsDNA input amounts is outlined below (expected yield is ≥500 ng of material for capture):
Note that library amplification may not be required for some applications. However, if library amplification is not performed, full-length adapters must be used for adapter ligation.