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- 09:09, 21 February 2015 Z8600021 talk contribs uploaded File:Neural tube SHH patterning cartoon.jpg (==Sonic Hedgehog acts in a graded manner to pattern the ventral neural tube== (A) A morphogen can pattern a developing tissue. A secreted signal (blue) is produced from a localized source (S) and spreads through the tissue to establish a gradient. Cel...)
