NAP1L1 and glioblastoma: Zottel et al., validated four VHHs (Nb79, Nb225, Nb179, and Nb314) targeting intracellular targets in GBM, including vimentin (VIM), mitochondrial translation elongation factor (EF-TU) (TUMF), nucleosome assembly protein 1-like 1 (NAP1L1), and dihydropyrimidinase-related 2 (DPYSL2) protein, respectively.