Looking at cells You can see some cells with your naked eye, such as an unfertilised ostrich egg which is a single cell.
It was unfortunate that the definition of an embryo in the HFEA overlooked that cloning could be done using an unfertilised ovum.
It is transferred to a unfertilised human ovum which has had its original nucleus removed.
When these hatch, the baby whelks feed on the unfertilised eggs.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.