# \#reference-mapping

**URL:** https://discourse.scverse.org/tag/reference-mapping/5.md

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## [Reference mapping with missing genes (vars) in SCVI / scANVI](https://discourse.scverse.org/t/reference-mapping-with-missing-genes-vars-in-scvi-scanvi/284)

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**Author:** [@semenko](https://discourse.scverse.org/u/semenko)\
**Replies:** 1\
**Last updated:** [December 10, 2022, 3:04am UTC](https://discourse.scverse.org/t/reference-mapping-with-missing-genes-vars-in-scvi-scanvi/284 "2022-12-10T03:04:50Z")

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I’m trying to map some human samples to a Tabula Sapiens reference, and have trained an SCVI model, but our internal data are missing some of the vars / genes in the trained Tabula Sapiens reference: ValueError: Number …