House: 2г—3 — Dr.

: House treats them as a single organism with three different "outputs." He theorizes that while their DNA is the same, their epigenetics —how those genes are expressed—have diverged due to secret lifestyle differences.

The title refers to a high-stakes medical mystery where Dr. Gregory House must solve a case involving a set of triplets whose identical DNA makes diagnosing their divergent symptoms a nightmare . The Case of the Mirror Triplets

had a delayed reaction that eventually triggered a cytokine storm. The Resolution Dr. House: 2Г—3

House observes the sisters in their shared room. He notices that while they look identical, Maya (the one with lung failure) has a slightly different callus on her finger. He realizes she isn't just a gymnast; she’s a secret smoker. But that doesn't explain Lea's seizures.

: House’s team (Chase, Cameron, and Foreman) is stymied. Because they are monozygotic triplets, any genetic defect should be present in all three. However, their bodies are reacting differently to the same environment. : House treats them as a single organism

: Cuddy pressures House to find a solution before Maya’s lungs fail completely. Meanwhile, House is distracted by Wilson, who has started "triplet-dating" (dating a woman who is also a triplet), leading to a series of pranks about identity and individuality. The "Eureka" Moment

House discovers that the sisters were all taking a specific "natural" performance-enhancing supplement to stay thin for gymnastics. Because of a rare phenomenon in female development (skewed X-inactivation), each sister's body processed the supplement's toxins differently: The Case of the Mirror Triplets had a

liver couldn't break down the heavy metals, leading to pulmonary edema. Lea's neurological system took the hit, causing seizures.