From: Keith Henson (hkhenson@rogers.com)
Date: Fri 11 Jul 2003 - 22:46:57 GMT
Since this was a topic recently . . . . .
Proliferation organizes specification Temporal colinearity of Hox gene 
expression is driven by cellular proliferation | By Cathy Holding
Hox genes are a group of approximately 40 genes that control the 
anterior-posterior axial development in all animals that show such 
polarity. Much interest surrounds the precise regulation of this complex 
patterning, which depends inter alia upon qualitative and quantitative 
differences in Hox gene product levels in different tissues at different 
times. The expression pattern of this group of genes is described as 
temporal colinearity—genes are expressed in time in the same order that 
they appear on the genome—but the mechanism by which this transcription 
ordering is achieved has been unclear.
http://www.biomedcentral.com/news/20030711/02
Keith Henson
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