Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Threshold expression
Introduction
The phenomenon within molecular biochemistry when more than half of the Mitochondrial DNA copies are defective, causing mitochondrial disease to become more pronounced and unavoidable.