The embryo is mostly derived from the descendants of the inner cell mass, whereas the external cells, the trophoblasts or trophectoderm, produce no embryonic structures (Gardner 1983; Hogan et al. 1994).

He gestured his disgust.

I don't really pay rent, but I always leave a little 'something something' on Fridays just to let her know I care.

If you make the animal angry, walk slowly backwards and avoid making eye contact.