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Science 22 August 1997:
Vol. 277. no. 5329, pp. 1103 - 1106
DOI: 10.1126/science.277.5329.1103
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Reports

In Situ Activation Pattern of Drosophila EGF Receptor Pathway During Development

Limor Gabay, Rony Seger, Ben-Zion Shilo *

Signaling cascades triggered by receptor tyrosine kinases (RTKs) participate in diverse developmental processes. The active state of these signaling pathways was monitored by examination of the in situ distribution of the active, dual phosphorylated form of mitogen-activated protein kinase (ERK) with a specific monoclonal antibody. Detection of the active state of the Drosophila epidermal growth factor receptor (DER) pathway allowed the visualization of gradients and boundaries of receptor activation, assessment of the distribution of activating ligands, and analysis of interplay with the inhibitory ligand Argos. This in situ approach can be used to monitor other receptor-triggered pathways in a wide range of organisms.

L. Gabay and B.-Z. Shilo, Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel.
R. Seger, Department of Membrane Research and Biophysics, Weizmann Institute of Science, Rehovot 76100, Israel.
*   To whom correspondence should be addressed. E-mail: lvshilo{at}weizmann.weizmann.ac.il

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