AUTHOR=Rocha Camila Loreta , Cardoso Carmen LĂșcia TITLE=Kallikrein immobilized on magnetic beads for activity-based assays using mass spectrometry JOURNAL=Frontiers in Analytical Science VOLUME=5 YEAR=2025 URL=https://www.frontiersin.org/journals/analytical-science/articles/10.3389/frans.2025.1514381 DOI=10.3389/frans.2025.1514381 ISSN=2673-9283