diff --git a/src/patterns/data/default/entity_attribute.tsv b/src/patterns/data/default/entity_attribute.tsv
index 63fa4bd2..a63e4dfe 100644
--- a/src/patterns/data/default/entity_attribute.tsv
+++ b/src/patterns/data/default/entity_attribute.tsv
@@ -529,7 +529,7 @@ OBA:VT0004236	masseter muscle size trait	UBERON:0001597	masseter muscle	PATO:000
 OBA:VT0004238	pterygoid muscle size trait	UBERON:0006720	pterygoid muscle	PATO:0000117	size			
 OBA:VT0004240	temporalis muscle size trait	UBERON:0001598	temporalis muscle	PATO:0000117	size			
 OBA:VT0004252	heart tube looping direction	GO:0001947	heart looping	PATO:0000039	direction			
-OBA:VT0004257	placenta mass	UBERON:0001987	placenta	PATO:0000125	mass			
+OBA:VT0004257	placenta mass	UBERON:0001987	placenta	PATO:0000125	mass	placental weight	PMID:37798380	
 OBA:VT0004258	placenta size trait	UBERON:0001987	placenta	PATO:0000117	size			
 OBA:VT0004264	extraembryonic tissue physiology trait	UBERON:0000478	extraembryonic structure	PATO:0001509	functionality			
 OBA:VT0004266	placenta color	UBERON:0001987	placenta	PATO:0000014	color			
diff --git a/src/patterns/definitions.owl b/src/patterns/definitions.owl
index 0ecc0a66..314d01e8 100644
--- a/src/patterns/definitions.owl
+++ b/src/patterns/definitions.owl
@@ -113977,7 +113977,9 @@ EquivalentClasses(<http://purl.obolibrary.org/obo/OBA_VT0004256> ObjectIntersect
 # Class: <http://purl.obolibrary.org/obo/OBA_VT0004257> (placenta mass)
 
 AnnotationAssertion(Annotation(<http://www.geneontology.org/formats/oboInOwl#hasDbXref> "AUTO:patterns/patterns/entity_attribute"^^xsd:string) <http://purl.obolibrary.org/obo/IAO_0000115> <http://purl.obolibrary.org/obo/OBA_VT0004257> "The mass of a placenta."^^xsd:string)
+AnnotationAssertion(<http://www.geneontology.org/formats/oboInOwl#hasDbXref> <http://purl.obolibrary.org/obo/OBA_VT0004257> "PMID:37798380"^^xsd:string)
 AnnotationAssertion(Annotation(<http://www.geneontology.org/formats/oboInOwl#hasDbXref> "AUTO:patterns/patterns/entity_attribute"^^xsd:string) <http://www.geneontology.org/formats/oboInOwl#hasExactSynonym> <http://purl.obolibrary.org/obo/OBA_VT0004257> "mass of placenta"^^xsd:string)
+AnnotationAssertion(<http://www.geneontology.org/formats/oboInOwl#hasExactSynonym> <http://purl.obolibrary.org/obo/OBA_VT0004257> "placental weight"^^xsd:string)
 AnnotationAssertion(rdfs:label <http://purl.obolibrary.org/obo/OBA_VT0004257> "placenta mass"^^xsd:string)
 EquivalentClasses(<http://purl.obolibrary.org/obo/OBA_VT0004257> ObjectIntersectionOf(<http://purl.obolibrary.org/obo/PATO_0000125> ObjectSomeValuesFrom(<http://purl.obolibrary.org/obo/RO_0000052> <http://purl.obolibrary.org/obo/UBERON_0001987>)))