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	<title>Progress zone - Revision history</title>
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	<updated>2026-04-06T06:45:18Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://wikimd.com/index.php?title=Progress_zone&amp;diff=6519116&amp;oldid=prev</id>
		<title>Prab: CSV import</title>
		<link rel="alternate" type="text/html" href="https://wikimd.com/index.php?title=Progress_zone&amp;diff=6519116&amp;oldid=prev"/>
		<updated>2025-03-18T00:11:58Z</updated>

		<summary type="html">&lt;p&gt;CSV import&lt;/p&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 00:11, 18 March 2025&lt;/td&gt;
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		<author><name>Prab</name></author>
	</entry>
	<entry>
		<id>https://wikimd.com/index.php?title=Progress_zone&amp;diff=6280677&amp;oldid=prev</id>
		<title>Prab: CSV import</title>
		<link rel="alternate" type="text/html" href="https://wikimd.com/index.php?title=Progress_zone&amp;diff=6280677&amp;oldid=prev"/>
		<updated>2025-02-11T06:15:10Z</updated>

		<summary type="html">&lt;p&gt;CSV import&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 06:15, 11 February 2025&lt;/td&gt;
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&lt;/table&gt;</summary>
		<author><name>Prab</name></author>
	</entry>
	<entry>
		<id>https://wikimd.com/index.php?title=Progress_zone&amp;diff=5167820&amp;oldid=prev</id>
		<title>Prab: CSV import</title>
		<link rel="alternate" type="text/html" href="https://wikimd.com/index.php?title=Progress_zone&amp;diff=5167820&amp;oldid=prev"/>
		<updated>2024-02-19T23:24:00Z</updated>

		<summary type="html">&lt;p&gt;CSV import&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;&amp;#039;&amp;#039;&amp;#039;Progress zone&amp;#039;&amp;#039;&amp;#039; is a term used in [[embryology]] to describe a region at the distal end of a developing limb bud where cells remain undifferentiated. The concept of the progress zone model was first proposed by Summerbell, Lewis, and Wolpert in 1973.&lt;br /&gt;
&lt;br /&gt;
==Etymology==&lt;br /&gt;
The term &amp;quot;progress zone&amp;quot; was coined by Summerbell, Lewis, and Wolpert in their 1973 paper. The term is derived from the idea that this area of the limb bud is where progress is made in terms of cell differentiation and limb development.&lt;br /&gt;
&lt;br /&gt;
==Function==&lt;br /&gt;
The progress zone plays a crucial role in [[limb development]]. Cells in the progress zone receive signals from the [[apical ectodermal ridge]] (AER), a thickened area of ectoderm at the tip of the limb bud. These signals keep the cells in the progress zone in an undifferentiated state. As cells leave the progress zone, they begin to differentiate and contribute to the formation of the limb&amp;#039;s structures.&lt;br /&gt;
&lt;br /&gt;
==Related Terms==&lt;br /&gt;
* [[Apical ectodermal ridge]] (AER): A thickened area of ectoderm at the tip of the limb bud that sends signals to the progress zone.&lt;br /&gt;
* [[Zone of polarizing activity]] (ZPA): A region in the posterior part of the limb bud that plays a role in anterior-posterior patterning.&lt;br /&gt;
* [[Retinoic acid]]: A signaling molecule that has been implicated in regulating progress zone activity.&lt;br /&gt;
&lt;br /&gt;
==See Also==&lt;br /&gt;
* [[Limb development]]&lt;br /&gt;
* [[Embryology]]&lt;br /&gt;
* [[Cell differentiation]]&lt;br /&gt;
&lt;br /&gt;
==References==&lt;br /&gt;
&amp;lt;references /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
[[Category:Embryology]]&lt;br /&gt;
[[Category:Developmental biology]]&lt;br /&gt;
[[Category:Cell biology]]&lt;br /&gt;
{{stub}}&lt;/div&gt;</summary>
		<author><name>Prab</name></author>
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