Upstream and downstream

Upstream and downstream can refer to:

• Upstream and downstream (DNA), determining relative positions on DNA
• Upstream and downstream (transduction) determining temporal and mechanistic order of cellular and molecular events of signal transduction

• Upstream and Downstream, the notional directions which lie "towards" and "away from" the author of a piece of software, relative to the speaker

• Upstream (disambiguation)
• Downstream (disambiguation)