As a control, they exposed other mice to dust from similar geological regions outside combat — inert titanium dioxide from Georgia clay; samples from a Montana titanium mine; dirt from Camp Pendleton in California.
作为对照,他们将其他小鼠暴露在战斗以外的类似地质区域的灰尘中——来自乔治亚州粘土的惰性二氧化钛;来自蒙大拿州钛矿的样本;来自加州彭德尔顿营的泥土。