Identification of the sex of human preimplantation embryos in two hours using an improved spreading method and fluorescent in-situ hybridization (FISH) using directly labelled probes , s f( ]& r/ d& k: s
Hum. Reprod. (1994) 9(4): 721-724 ; Q$ ^( L- n& \. K$ c; p% Qhttp://humrep.oxfordjournals.org/content/9/4/721.long