Lab‐in‐a‐Bead: Magnetic Janus Bead Probe for the Detection of Biomarkers in Blood. - Gunatilake, Udara Bimendra; Caballe‐Abalos, Adriana; Garcia‐Rey, Sandra; Mercader‐Ruiz, Jon; Basabe‐Desmonts, Lourdes; Benito‐Lopez, Fernando (Advanced Materials Interfaces, 2023)