Hancock: Cell Signalling 2e 
FiguresHancock: Cell Signalling 2e
Web link library
Although the internet is a vast source of information, much of what is accessible is not well written, not peer reviewed, and potentially misleading. However, several journals and companies have excellent web sites that are valuable sources of information in cell signalling.
Among these are:
• Nature: www.signaling-gateway.org
• Science: stke.sciencemag.org
• Molecular Probes: www.probes.com
An excellent site from a company that supplies fluorescent probes for molecular biological studies.
• Calbiochem: www.calbiochem.com
An excellent site by a company supplying chemicals for cell signalling research; an internet site full of information.
• Cytokines and chemokines: www.rndsystems.com
• Hormone levels: www.il-st-acad-sci.org//data2.html
• Nuclear receptor resource: nrr.georgetown.edu/NRR/nrrhome.htm
• Nuclear RDB: www.receptors.org/NR
• Ligand binding: alto.compbio.ucsf.edu/ligbase
Web-held images
Many companies, for example those that sell the machinery, and those that sell the probes, have confocal microscopy/Ca2+ ion images on their web pages. Many research teams too show their images on university-held web pages, so the use of a search engine with an author's name could easily reveal images from confocal microscopy work. A good place to start would be the site of Molecular Probes. Their URL is: www.probes.com
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