1.   The first brain scan proved negative.

2.   Williams played through the sixth inning Saturday night before leaving for precautionary X-rays, which proved negative.

3.   Repeated microbiological examination of sputum, blood, and urine proved negative.

4.   The mice showed symptoms of poisoning by the Alexandrium toxins produced by phytoplankton, but comparisons with known Alexandrium toxins proved negative.

5.   Samples from Hamanaka and Badastan, who returned with irregular heartbeats following their defeats at Leicester and Sandown last Thursday, have also proved negative.

6.   All X-rays proved negative.

7.   Anderson, who walked to the ambulance on his own, was released several hours later after a CT scan proved negative, according to UCLA spokesman Marc Dellins.

8.   Arroyo was taken to Massachusetts General Hospital but released Sunday night after X-rays proved negative.

9.   Barnes lay screaming on the floor before being carried off the court and taken to UCLA Medical Center, where X-rays proved negative.