Unfrozen subsurface water on Mars: presence and implications

Uni-directional polymerization leading to homochirality in the RNA world

Unidentifiable divergence times in rates-across-sites models

Uniformly curated signaling pathways reveal tissue-specific cross-talks and support drug target discovery

Unifying Evolutionary and Network Dynamics

Unifying Paradigms for Complex Fe-S Cluster Biosynthesis as Revealed by the Structure of a Key [FeFe]-Hydrogenase Intermediate

Unifying Theories of Molecular, Community and Network Evolution

Unique mechanisms from finite two-state trajectories

Unique perfect phylogeny is NP-hard

Uniqueness of steady states for a certain chemical reaction

Uniqueness, intractability and exact algorithms: reflections on level-k phylogenetic networks

Units of genetic transfer in prokaryotes

Unity of cosmic life and the inevitability of evolved life forms

Unity of Science: from High-Energy Neutrinos to Abrupt Climate Change and Life in Ice

Universal 1/f noise, cross-overs of scaling exponents, and chromosome specific patterns of GC content in DNA sequences of the human genome

Universal Cognitive Maps and the Search for Intelligent Life in the Universe

Universal core modules govern the dynamics of cellular regulatory networks

Universal Features in the Genome-level Evolution of Protein Domains

Universal features of surname distribution in a subsample of a growing population

Universal Mortality Law, Life Expectancy and Immortality