Proceedings of the National Academy of Sciences: Proceedings of the National Academy of Sciences: Table of Contents

1. In This Issue
   Proceedings of the National Academy of Sciences, Volume 123, Issue 42, October 2026. <br/>
2. Reconstructing actin dynamics of the leading edge from observational data
   Proceedings of the National Academy of Sciences, Volume 123, Issue 42, October 2026. <br/>SignificanceTraditionally, models of intracellular mechanochemistry are intuited from perturbative experiments. Multiplex microscopy imaging changes this by providing measurements of naturally fluctuating densities of key proteins in unperturbed cells. We ...
3. Nitrogen deposition does not alter the temperate forest soil carbon pool: A 14-y experiment on varied nitrogen fertilization
   Proceedings of the National Academy of Sciences, Volume 123, Issue 42, October 2026. <br/>Soil carbon (C) pools in nitrogen-limited temperate forests are critical to the global C cycle, but there are no long-term experiments examining soil C, with various nitrogen (N) forms. Here, a 14-y experiment (100 kg N ha−1y−1), with added N simulating ...
4. Efficient and accurate steering of large language models through attention-guided feature learning
   Proceedings of the National Academy of Sciences, Volume 123, Issue 42, October 2026. <br/>SignificanceLarge language models (LLMs) build and manipulate internal representations of language to respond to prompts. Recent works showed that representations of semantic notions (concepts) can be extracted from LLMs and used to steer responses toward ...
5. Modulation of avian iridescence via melanogenesis
   Proceedings of the National Academy of Sciences, Volume 123, Issue 42, October 2026. <br/>SignificanceBird feathers can produce brilliant, shifting colors, but how these colors form during development has remained poorly understood. By comparing the genomes of color variants of domesticated peafowl and transcriptomes during feather development ...