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a protein abundantly present in many cells, especially muscle cells, that significantly contributes to the cell’s structure and motility. Actin can ...
(f d r ´g bärôt´ch , –ch ) (KEY) , c.1530–1612, Italian painter, b. Urbino, where he was continually employed throughout his life. In the 155...
(äl s´s bäld v n t´t ) (KEY) , c.1425–1499, Italian painter and decorative artist of the early Florentine Renaissance. He was probably trained ...
( k´´t n m´ t r) (KEY) , instrument used to measure the heating power of radiation. Actinometers are used chiefly in meteorology to measure solar r...
(ädämäwä´, d´´ mä´w ) (KEY) , plateau, c.26,000 sq mi (67,300 sq km), N central Cameroon and E Nigeria, W central Africa. It is sparsely pop...
( j´´ l ´d s) (KEY) , c.540–c.460 B.C., Greek sculptor of the Argive school, famous for his statues of gods and Olympian athletes. Some modern au...