Rapamycin derivatives containing substituents at C-28 in the epi orientation relative to rapamycin are disclosed, together with methods for their preparation and use, e.g. for regulation of biological phenomena in engineered cells. The compounds may contain optional additional modifications relative to rapamycin, as disclosed herein.

 
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> Salt forms of poorly soluble probucol esters and ethers

> Method of cancer screening primarily utilizing non-invasive cell collection, fluorescence detection techniques, and radio tracing detection techniques
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