# Hemilineage **Entity class:** Concept or analytic term **Collection:** [[collections/Neurotech|Neurotech]] **Type:** Developmental neurobiology concept **Primary source:** [[articles/2026 Annual Report on Brain-Computer Interfaces|2026 Annual Report on Brain-Computer Interfaces]] ## Definition A **hemilineage** is a developmental grouping of neurons descending from one branch of a neural progenitor lineage after an asymmetric division pattern. ## Relationships - The [[wiki/Cambridge Drosophila Connectomics Group|Cambridge Drosophila Connectomics Group]] used hemilineages as developmental units in FlyWire annotation. - Hemilineage, [[wiki/Neuronal Class|neuronal class]], and [[wiki/Cell Type|cell type]] are related but non-interchangeable classification levels. <!-- BEGIN HUMANIZED RELATIONSHIPS 2026-09-11 --> This entry's documented connections are expressed in its definition and related-work routes, with provenance retained in the source-linked material. <!-- END HUMANIZED RELATIONSHIPS 2026-09-11 --> ## Related Work in the Corpus <!-- BEGIN HUMANIZED CORPUS ROUTES 2026-09-11 --> - In [[articles/2026 Annual Report on Brain-Computer Interfaces|2026 Annual Report on Brain-Computer Interfaces]], **FlyWire: Whole-Brain Completeness at Insect Scale** provides the narrative context for **Hemilineage**: The companion annotation paper, led by the Cambridge Drosophila Connectomics Group under Gregory Jefferis (MRC Laboratory of Molecular Biology and University of Cambridge), provided systematic hierarchical annotation of neuronal… <!-- END HUMANIZED CORPUS ROUTES 2026-09-11 -->