Figure 1. Methylation density across sites of SNPs. Methylation maps from hearts (blue) and sperm (green) from Europeans were used and aggregate methylation density was plotted against sites 1000 to þ1000 bp of European, Asian, African high-Fst-SNPs, and random SNPs. European methylation density showed a statistically significant pattern of modulation only in European high Fst-SNPs but not high...

This study set out to establish a new method, using flow cytometry, to evaluate leukocytes in semen. Ejaculates of 59 males, asymptomatic for genitourinary infections, were examined. Routine semen analyses were carried out as well as peroxidase and polymorphonuclear granulocyte-elastase detection. Leukocytes were detected combining flow cytometry and monoclonal antibodies (anti-CD45, anti-CD53)...

Sexual conflict, where male and female reproductive interests differ, is probably widespread and often mediated by male or sperm proteins and female or egg proteins that bind to each other during mating or fertilization. One potential consequence is maintenance of polymorphism in these proteins, which might result in reproductive isolation between sympatric subpopulations. I investigate the con...

The reproductive biology of social Hymenoptera is characterized by lifelong sperm storage by queens and sperm limitation in males. Both sexes are therefore expected to be especially choosy about their mating partners. In particular, sexuals should avoid sib-mating because of the resulting risk of producing sterile diploid male offspring. Colonies of the ant Leptothorax gredleri are specialists ...

sperms are highly specialized cells for delivering dna from male to the ovum. incredibly, wide degree of diversity in sperm morphology in their basic structures i.e. head, middle piece and tail is found across species. differences in terms of overall size of the sperm, shape and number of sperm produced are also incredible. one of the key for this variations or diversity in sperm may be associa...

BACKGROUND The purpose of this study was to compare laboratory and clinical outcomes of intracytoplasmic morphologically selected sperm injection (IMSI) and conventional intracytoplasmic sperm injection (ICSI) in couples with repeated implantation failures. METHODS A total of 200 couples with at least two prior unsuccessful ICSI cycles were enrolled: 100 couples were submitted to IMSI and 100...