Designed Ankyrin Repeat Proteins as Novel Binders for Ultrasound Molecular Imaging. - Kosareva, Alexandra; Punjabi, Mukesh; Ochoa-Espinosa, Amanda; Xu, Lifen; Schaefer, Jonas V.; Dreier, Birgit; Plückthun, Andreas; Kaufmann, Beat A. (Ultrasound in Medicine & Biology, 2021)