cheap cialis online pharmacy To rigorously dissociate the genomic and non genomic activities of E2, John Katzenellenbogen has developed two pharmacological tools to specifically activate the rapid membrane signaling i the Estrogen dendrimer conjugate EDC, which can cross the plasma membrane but cannot enter the nucleus due to its charge and size 118 and ii the pathway preferential estrogens PaPEs which only activate non genomic signaling, due to their very low affinities and rapid dissociation rates 119