21.   Mineralogists said similar reactions could occur in glass at the energy levels being considered by companies competing for postal contracts.

22.   Most bad reactions to Ecstasy occur when it is combined with other drugs and alcohol.

23.   Most often, allergic reactions to food occur within four hours of ingestion.

24.   No allergic reactions occur at this stage, but the mast cells put out receptors in anticipation of a reaction.

25.   Snyder did not include female rats in the study to see if a similar reaction occurred.

26.   Such a reaction occurred on Thursday.

27.   The mild reactions typically occur with small doses given for brief periods.

28.   The reaction occurred using the family recipe and in several of a dozen commercial chicken soups tested.

29.   The reactions apparently occurred when the cartoon depicted a child and monster inside a computer battling a program designed to kill viruses.

30.   The spill caused a reaction to occur, which created a cloud of smoke.