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The 5 HT also " appear to involve control of appetite , sleep , memory and learning , temperature regulation , mood , behavior , cardiovascular function , muscle contraction , endocrine regulation , and depression . Here the role of Tat-specific cytotoxic T lymphocytes ( CTL ) in controlling pathogenic simian immunodeficiency virus SIVmac239 replication after using a DNA-prime , vaccinia virus Ankara-boost vaccine regimen is assessed . Students enjoy interactive lessons in which animated characters address them by name , offer help with research-based spelling strategies , and congratulate success . Direct costs are those costs that can be directly attributed to providing a service , such as the cost of a nurse 's time ( salary ) , medical supplies and equipment , administrative costs of billing , record maintenance , and the scheduling of office patients .