The responsibilities of Core B will involve the performance of two separate but related functions: 1) The Tissue Culture unit will provide tissue culture cells and the expertise necessary to complete the cellular biology protocols in the individual proposals and 2) The Molecular Biology unit will provide reagents and expertise to complete the molecular biology experiments described in the five projects. Described below are specific details of the primary methods used in Core B. These include, but are not limited to, reverse transcriptase (RT) polymerase chain reaction (PCR), RT real-time PCR, Northern, Southern and Western blot analysis, development of antisense oligonucleotides and siRNAs, subcloning of gene fragments for riboprobe development, and riboprobe synthesis, and targeted gene array analysis. These procedures will be provided to the investigators during the course of the proposed studies as required and new methodologies will be developed as needed.