The Agriculture Department's in-house body of scientists, the Agricultural Research Service, shrinks by 82 percent to just over 1,100 people. Those exempt from the furlough will maintain laboratories, greenhouses and care for research animals; there are time-sensitive data to collect as well as crops and cells to tend. The USDA shutdown plan allows studies involving human subjects to continue. The Agriculture Department did not respond to a request for comment on Thursday, perhaps because the USDA shutdown plan furloughs all but two of the 58 people who work in its communications office.