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Two vascular networks-the blood system and the lymphatic system-are required for maintaining tissues in a healthy state. In their Perspective, [Jain and Padera][1] discuss new work ([Abtahian][2] et al .) that identifies two signaling molecules involved in the separation of the blood and lymphatic networks during embryonic development. [1]: http://www.sciencemag.org/cgi/content/full/299/5604/209 [2]: http://www.sciencemag.org/cgi/content/short/299/5604/247
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Timothy P. Padera (2003) studied this question.
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