Morphogens are secreted signalling molecules that control the patterning and growth of developing organs. How they regulate patterning is well described, but growth control is less well understood.

Datar, Srikant M., Marc J. Epstein, and Kristi Yuthas. "Management Accounting and Control: Lessons for and from the World's Tiniest Businesses." Strategic Finance 91, no. 5 (November 2009).

KUALA LUMPUR, Malaysia—There are macaques everywhere—climbing on the rocks, grooming one another as they sit on the forest floor. Others have babies on their backs as they trot along at a fair clip.