SLAIN1 (SLAIN motif family member 1) is a microtubule plus-end tracking protein that plays a crucial role in regulating cytoplasmic microtubule dynamics and organization 1. The protein functions by interacting with End Binding family members to target microtubule tips and recruits the microtubule polymerase ch-TOG to promote persistent microtubule growth 1. SLAIN1 is highly enriched in brain tissue and expressed throughout mouse brain development, where it is essential for proper axon elongation during neuronal development by controlling microtubule catastrophe frequency 1. Originally identified as a stem cell-associated gene, SLAIN1 is selectively expressed in undifferentiated embryonic stem cells and shows early embryonic expression in the epiblast before becoming restricted to the developing nervous system by E9.5 23. The gene has emerged as a potential biomarker in various pathological conditions, including idiopathic pulmonary fibrosis, where it may serve as a diagnostic signature 4, and in cancer contexts such as hepatocellular carcinoma and glioblastoma recurrence 56. SLAIN1, together with its homologue SLAIN2, represents a structurally unique gene family conserved throughout vertebrate evolution 2.