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One is to process and present antigen , or material considered foreign to the body , allowing other immune system cells to recognize foreign material and tumor cells . Professor Handmer ’ s team will also determine the validity and effectiveness of the ‘ Stay or Go ’ policy , which urges people to make the decision to defend a well-prepared property , or leave well before a fire . A model is a complex information structure , such as a relational schema , XML schema , UML model , or program interface . Now we are engaged in a great civil war , testing whether that nation , or any nation so conceived and so dedicated , can long endure . A multicenter team of researchers , led by Dr. Anne McTiernan of the Public Health Sciences Division , found that women who had the lowest body-mass index , or BMI , and the highest physical-activity levels had the lowest levels of circulating estrogens , sex hormones that can fuel breast-cancer growth .