The research, published in PLOS Biology, found that the simple, reversible chemical treatment could dramatically alter the 50:50 male and female offspring ratio so that sex selection would be possible. The study was carried out on mice but is likely widely applicable to other mammals too.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/scientists-develop-sperm-separation-method-which-could-lead-to-gender-selection-in-ivf