decreases by repression quantity of The entity A has an activity that down-regulates by repression the quantity of B. The down-regulation is due to A having an effect on an intermediate entity (typically a DNA or mRNA element) which can produce B. For example, protein A (transcription factor) indirectly decreases by repression the quantity of protein B (gene product) if and only if A negatively regulates the process of transcription or translation of a nucleic acid element that produces B. indirectly negatively regulates quantity of material entity Vasundra Touré