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Morphology of nanoselected spermatozoa after dose-dependent labeling/removal procedures. Asteriks indicate significant differences between MNP concentrations, within the same parameters corresponding to proximal cytoplasmic droplet (PD), distal cytoplasmic droplet (DD), coiled tail (CT), and bent tail (BT). *P < 0.05 indicates difference from other groups and **P = 0.04 indicates difference from the control only. Data are mean ± SEM of at least four independent replicates
