Sydney Brenner and Francois Jacob's discovery of messenger RNA-which c
arries the information for making protein from the DNA to the ribosome
s-shows how creativity requires a variety of skills and the ability to
integrate a considerable amount of knowledge. Most important was the
correct formulation of the problem. Nor only did the discovery require
a theoretical understanding, but also considerable experimental skill
s. It provides an example of sudden illumination. The concept of posit
ional information in relation to the development of pattern during emb
ryonic development is another example of a change in paradigm in cell
biology from metabolism to information. it was based on the aesthetic
conviction that there must be general mechanisms for converting geneti
c information into spatial pattern.