1.   Though gastrin is recognised to be the main mediator of meal stimulated acid secretion, the effect of H pylori on acid secretion remains unclear.

2.   Though gastrin is considered to be the main mediator of food stimulated acid secretion, its role in the regulation of basal acid output is unclear.

3.   Parathyroid hormone-related protein is the main humoral mediator of hypercalcaemia in solid tumours and acts on both bone and kidney.

4.   It will still be the main mediator.

5.   But Chernomyrdin, the main mediator between NATO and Milosevic, said Yugoslavia had agreed to the central demands made by Western countries.

6.   Chernomyrdin has become the main mediator between NATO and Yugoslavia, and he has sounded consistently upbeat as he shuttles between world capitals to discuss the Kosovo crisis.

7.   Chiluba is serving as the main mediator in the conflict.

8.   Chernomyrdin has been the main mediator between NATO and Milosevic since the bombing campaign began more than two months ago.

9.   Chernomyrdin, the main mediator between NATO and Yugoslavia, has consistently sounded upbeat about prospects for a settlement and the quick implementation of a peace deal in Kosovo.

10.   Egypt has been a main mediator in the peace talks between Israel and the Palestinians, and Arafat often consults Mubarak, especially in times of crises.