diff --git a/src/patterns/definitions.owl b/src/patterns/definitions.owl
index 59abf3a8a..1d195b436 100644
--- a/src/patterns/definitions.owl
+++ b/src/patterns/definitions.owl
@@ -305,7 +305,6 @@ AnnotationAssertion(rdfs:label <http://purl.obolibrary.org/obo/UBERON_8420001> "
 SubClassOf(<http://purl.obolibrary.org/obo/UBERON_8420001> <http://purl.obolibrary.org/obo/UBERON_0001638>)
 SubClassOf(<http://purl.obolibrary.org/obo/UBERON_8420001> ObjectSomeValuesFrom(<http://purl.obolibrary.org/obo/BFO_0000050> <http://purl.obolibrary.org/obo/UBERON_0011241>))
 SubClassOf(<http://purl.obolibrary.org/obo/UBERON_8420001> ObjectSomeValuesFrom(<http://purl.obolibrary.org/obo/RO_0002376> <http://purl.obolibrary.org/obo/UBERON_0011192>))
-SubClassOf(<http://purl.obolibrary.org/obo/UBERON_8420001> ObjectSomeValuesFrom(<http://purl.obolibrary.org/obo/RO_0020101> <http://purl.obolibrary.org/obo/UBERON_0011192>))
 SubClassOf(<http://purl.obolibrary.org/obo/UBERON_8420001> ObjectSomeValuesFrom(<http://purl.obolibrary.org/obo/RO_0020102> <http://purl.obolibrary.org/obo/UBERON_0011241>))
 
 # Class: <http://purl.obolibrary.org/obo/UBERON_8420002> (anterior ethmoidal vein)