TY - RPRT TI - Cracking the egg: increased complexity in the zona pellucida. AU - S J Conner AU - L Lefièvre AU - D C Hughes AU - C L R Barratt PY - 2005 DO - 10.1093/humrep/deh835 UR - https://pubmed.ncbi.nlm.nih.gov/15760956/ ID - 15760956 ER -