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Many different types of services exist in an IN , a few of which are listed below . The simulations revealed in unprecedented detail how cells conduct water and glycerol , a molecule that serves cells ' metabolism . For example , for the 2002 PVS in a given school district , a maximum of three separate audit requests would be due before July 1 , 2005 . In the latter scheme , in order to create a checkpoint , a complete snapshot is taken for the whole model , usually by means of serialization . One interesting interloper is chayote , Sechium edule , a bizarre little cucurbit , or squash relative , also known as the vegetable pear , which can be procured in Spanish Harlem , Little Mexico , and Chinatown .