ESFS is an Entropy Sorting based feature selection package primarily developed for feature selection of single cell RNA sequencing datasets. - aradley/ESFS

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Single-cell RNA sequencing (scRNA-seq) has transformed our ability to resolve cellular heterogeneity, but extracting meaningful signals remains challenging due to technical noise, batch effects, and the limitations of current feature selection methods. We present Entropy Sorting Feature Selection (ESFS), a modular, user-friendly framework that captures multivariate gene expression relationships without imputation or denoising via latent spaces. Across diverse datasets, ESFS improves interpretability and reveals biology missed by standard workflows: identifying coherent developmental programs in eight independent human embryo datasets without batch integration; resolving spatial gene expression in mouse colon obscured by conventional analyses; distinguishing shared and tumour-specific microenvironments in glioblastoma; and disambiguating spatial, temporal, and neurogenic programs in the developing mouse neural tube. By operating in gene expression space, ESFS produces interpretable, biologically meaningful outputs while reducing artefacts introduced by feature extraction. These results position ESFS as a powerful means to uncover relevant molecular signatures in noisy, high-dimensional transcriptomics data. ### Competing Interest Statement The authors have declared no competing interest. Cancer Research UK, CC001051 Medical Research Council, https://ror.org/03x94j517, CC001051 Wellcome Trust, CC001051 Wellcome Trust, 220379/D/20/Z European Molecular Biology Organization, 792-2021 UK Research and Innovation, EP/X031225/1

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