To propose a statistical biosignature strategy that distinguishes biotic from abiotic samples using molecular abundance patterns.
Approach:
Key Findings:
Biotic samples showed greater diversity in amino-acid profiles compared to abiotic samples.
Fatty acids exhibited less evenness in biological samples, indicating a narrower selection of chain lengths.
The diversity signal can persist under harsh conditions, such as radiolytic degradation in Europa-like environments.
Interpretation:
The framework relies on abundance structure rather than pristine molecular inventories, making it suitable for imperfect samples likely to be returned from planetary missions.
Limitations:
The method's effectiveness in real extraterrestrial environments remains to be fully validated.
The approach may not account for all potential variables affecting molecular profiles.
Conclusion:
The first evidence of alien life may emerge as a pattern within a broader molecular assemblage rather than a clean chemical signature.
A JAMA Internal Medicine Viewpoint urges clinicians and health systems to verify risk-model inputs before acting on automated breast cancer screening recommendations.
