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Although, at present, the selection of sperm prior to ICSI is based on motility and morphology, undetectable anomalies, and more importantly damaged DNA are overlooked. In this regard, novel sperm selection procedures have gained much interest. For instance, sperm has been selected by Magnetic-Activated Cell Sorting (MACS) based on early apoptotic marker, the externalization of phosphatidylserine (EPS). Review of the literature has revealed that the efficiency of this technique has been mainly evaluated post Density Gradient Centrifugation (DGC). Therefore, there is a need to prove the efficiency of this technique independent of DGC. In addition, considering the fact that DGC induces EPS due to capacitation and acrosome reaction, therefore, the role of MACS before DGC(MACS-DGC) and MACS after DGC (DGC-MACS) should be assessed.

Density gradient centrifugation before or after magnetic-activated cell sorting: which technique is more useful for clinical sperm selection?