Which of the options given is not true of the French flag mechanism of pattern formation?
A) Differing concentrations of a teratogen provide positional values.
B) Cells develop according to threshold concentrations of a molecule.
C) Experiments using amphibian and insect limbs were among the first to lend support to this model.
D) The model gets its name from the three colors of the French flag (blue, white, red) .
Correct Answer:
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