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- Laterality Defect: A term referring to the disruption of typical left-right patterning in organ placement during development leading to situs (organ placement, structure or function) anomalies. (See also situs inversus, situs ambiguus, heterotaxy)
- Linkage Analysis: (synonym - indirect DNA analysis) Testing DNA sequence polymorphisms (normal variants) that are near or within a gene of interest to track within a family the inheritance of a disease-causing mutation in a given gene.
