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The exquisite synchronicity of sea urchin development provides a reliable model for studying maternal proteins in the haploid egg as well as those involved in egg activation, fertilization and early development. Sea urchin eggs are released by the millions, enabling the quantitative evaluation of maternally stored and newly synthesized proteins over a range of time (seconds to hours post fertilization). During this window of development exist many hallmark and unique biochemical interactions that can be investigated for the purpose of characterizing profiles of kinases and other signaling proteins, manipulated using pharmacology to test sufficiency and necessity, for identification of post translational modifications, and for capturing protein-protein interactions. Coupled with the fact that sea urchin eggs and embryos are transparent, this synchronicity also results in large populations of cells that can be evaluated for newly synthesized protein localization and identification through use of the Click-iT technology. We provide basic protocols for these approaches and direct readers to the appropriate literature for variations and examples.
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