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The? is referred to asthe gatekeeper.it issemi permable and allows only certain particles in or out.?

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The? is referred to asthe gatekeeper.it issemi permable and allows only certain particles in or out.?

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  1. Cell Membrane - "regulate transport in and out of cell"

    Cell Biology Graduate Program

    http://cellbio.utmb.edu/CELLBIO/membrane...

    "Cell membranes are differentially (or semi-) permeable barriers separating the inner cellular environment from the outer cellular (or external) environment."

    http://www.emc.maricopa.edu/faculty/fara...


  2. cell membrane or cell wall. i am not sure
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