这个词是什么意思？
A family of cell surface receptors that were originally identified by their structural homology to neurotropic TYROSINE KINASES and referred to as orphan receptors because the associated ligand and signaling pathways were unknown. Evidence for the functionality of these proteins has been established by experiments showing that disruption of the orphan receptor genes results in developmental defects.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D057050 · MeSH 2026。
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