Horizontal plane

... Still, I'm almost certain the spine movement is why it favored a horizontal to vertical plane.

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... formed from two separate feet, which would morph with more ease into a horizontal plane then a vertical one.

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... I may be able to say that on personal level but not on a scientific plane. Neither do I think that an evolutionist should say "look, horizontal gene transfer, this proves evolution." He can say it on a personal level, but ...

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The author's phrase "traverse the plane of the membrane" refers to the ability of transmembrane proteins to move ... of the membrane" makes some sense. If you picture the cell membrane as a horizontal plane, the transmembrane protein can move forward or back, left or right, ...

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