An absolute-value circuit outputs the absolute value of a signal SIN\u2032 that corresponds to an input signal SIN. The complement reset latch is formed by inserting a state element between the input and the output of the complement reset buffer. The primary content carries with it descriptive metadata that is accessed by a distribution server and forwarded to a secondary content source. These expression vectors may be utilized to produce the BRS virus protein or peptide in quantity; the resulting substantially pure viral peptide or protein may be incorporated into subunit vaccine formulations or may be used to generate monoclonal or polyclonal antibodies which may be utilized in diagnosis of BRS virus infection or passive immunization. In combination these traits set \u2018TEKO\u2019 apart from all other existing varieties of Tibouchina known to the inventor.