Mary-Kate's Private Battle. Like nearly everything they do, Mary-Kate and Ashley Olsen had planned to spend their 18th birthday on June 13 side by side. But when the much-hyped day arrived, Ashley was left to celebrate without her twin sister, first poolside at the Beverly Hills Hotel and then with a jaunt to Mexico with two pals.
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Porins are members of an extended family of transmembrane proteins found in the outer membrane of gram negative bacteria such as E. coli, or in the outer membranes of mitochondria in eukaryotes. The general porins provide a simple diffusion pathway across the membrane for molecules less than 1 kDa with little substrate selectivity.