Human embryo compaction, an essential step in the first days of an embryo's development, is driven by the contractility of its cells. These results contradict the presupposed driving role of cell ...

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

Extremal contractions which contract divisors to points in projective threefolds with ${\Bbb Q}\text{-factorial}$ terminal singularities are studied and divided into two categories: index increasing ...