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The regulator systems of Cosmos (promoters and repressors: see
Section 4.3.3) have no equivalent in Tierra. They were
designed specifically to allow
cells in a multicellular organism to be able to influence which
sections of code were being executed in neighbouring cells, thereby
promoting cell differentiation and specialisation. The design of the
regulator systems was inspired by the processes of chemical signalling
between cells, and the use of promoter sequences and repressors within
cells, in biological organisms.