blastocysts

"He still has nightmares resulting from the treatment he received from his captors."

"The success of the surgery depended on the precise implantation of the artificial hip joint. "

"The development of this story has been slow."

"The hen laid three brown eggs in the nest this morning. "

"After fertilization, the egg divides repeatedly, forming a blastula, a hollow ball of cells that's an early stage in embryo development. "

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"He looked over the menu, and selected the roast beef."

"The farmer fertilized his field with manure to help the crops grow better. "

"If you still feel unwell tomorrow, see your doctor."

"The zoo has a wide variety of mammalian species, from tiny bats to massive elephants. "

"He was father to three healthy kids."

"The camp monitors look after the children during the night, when the teachers are asleep."