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- 09:33, 9 August 2009 S8600021 talk contribs uploaded File:Emboj200912f1.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. Cells re)
