1.   The ball-hitch mechanism seemed to have gone rusty and jammed up since it was last used.

2.   Such a mechanism seems unlikely because platelet activating factor precursors increase under pentagastrin infusion.

3.   This mechanism seems to be the major means of RVI in gall bladder and renal epithelial cells, hepatocytes, and lymphocytes.

4.   Either possibility is open at the moment but a humoral mechanism seems unlikely in view of the lack of a suitable potential targt within the irradiated volume.

5.   A neural mechanism seems, by contrast, to be feasible.

6.   A number of processes have been proposed to explain the formation of back-arc basins but no one mechanism seems to be applicable to all cases.

7.   This mechanism seems to have arisen in parallel in these plants.