diff --git a/psi-ms.owl b/psi-ms.owl
index 2d8916e..baebaa3 100644
--- a/psi-ms.owl
+++ b/psi-ms.owl
@@ -10,7 +10,7 @@
      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
      xmlns:oboInOwl="http://www.geneontology.org/formats/oboInOwl#">
     <owl:Ontology rdf:about="http://purl.obolibrary.org/obo/ms.owl">
-        <owl:versionIRI rdf:resource="http://purl.obolibrary.org/obo/ms/4.1.188/ms.owl"/>
+        <owl:versionIRI rdf:resource="http://purl.obolibrary.org/obo/ms/4.1.189/ms.owl"/>
         <oboInOwl:NamespaceIdRule>* MS:$sequence(7,0,9999999)$</oboInOwl:NamespaceIdRule>
         <oboInOwl:NamespaceIdRule>* PEFF:$sequence(7,0,9999999)$</oboInOwl:NamespaceIdRule>
         <oboInOwl:date>13:01:2025 17:58</oboInOwl:date>
@@ -71726,6 +71726,51 @@
     
 
 
+    <!-- http://purl.obolibrary.org/obo/MS_1003434 -->
+
+    <owl:Class rdf:about="http://purl.obolibrary.org/obo/MS_1003434">
+        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/MS_1001045"/>
+        <rdfs:subClassOf>
+            <owl:Restriction>
+                <owl:onProperty rdf:resource="http://purl.obolibrary.org/obo/ms#has_regexp"/>
+                <owl:someValuesFrom rdf:resource="http://purl.obolibrary.org/obo/MS_1003435"/>
+            </owl:Restriction>
+        </rdfs:subClassOf>
+        <obo:IAO_0000115>A serine protease that hydrolyzes peptide bonds at the C-terminus of threonine, alanine, serine, and valine. (EC:3.4.21.12)</obo:IAO_0000115>
+        <oboInOwl:hasExactSynonym>alpha-lytic endopeptidase</oboInOwl:hasExactSynonym>
+        <oboInOwl:hasExactSynonym>alpha-lytic protease</oboInOwl:hasExactSynonym>
+        <oboInOwl:hasOBONamespace>MS</oboInOwl:hasOBONamespace>
+        <oboInOwl:id>MS:1003434</oboInOwl:id>
+        <rdfs:label>AlphaLP</rdfs:label>
+    </owl:Class>
+    <owl:Axiom>
+        <owl:annotatedSource rdf:resource="http://purl.obolibrary.org/obo/MS_1003434"/>
+        <owl:annotatedProperty rdf:resource="http://purl.obolibrary.org/obo/IAO_0000115"/>
+        <owl:annotatedTarget>A serine protease that hydrolyzes peptide bonds at the C-terminus of threonine, alanine, serine, and valine. (EC:3.4.21.12)</owl:annotatedTarget>
+        <oboInOwl:hasDbXref>DOI:10.1021/bi00445a015</oboInOwl:hasDbXref>
+        <oboInOwl:hasDbXref>DOI:10.1038/228438a0</oboInOwl:hasDbXref>
+    </owl:Axiom>
+    
+
+
+    <!-- http://purl.obolibrary.org/obo/MS_1003435 -->
+
+    <owl:Class rdf:about="http://purl.obolibrary.org/obo/MS_1003435">
+        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/MS_1001180"/>
+        <obo:IAO_0000115>Regular expression for alphaLP.</obo:IAO_0000115>
+        <oboInOwl:hasOBONamespace>MS</oboInOwl:hasOBONamespace>
+        <oboInOwl:id>MS:1003435</oboInOwl:id>
+        <rdfs:label>(?&lt;=[TSAV])</rdfs:label>
+    </owl:Class>
+    <owl:Axiom>
+        <owl:annotatedSource rdf:resource="http://purl.obolibrary.org/obo/MS_1003435"/>
+        <owl:annotatedProperty rdf:resource="http://purl.obolibrary.org/obo/IAO_0000115"/>
+        <owl:annotatedTarget>Regular expression for alphaLP.</owl:annotatedTarget>
+        <oboInOwl:hasDbXref>PSI:PI</oboInOwl:hasDbXref>
+    </owl:Axiom>
+    
+
+
     <!-- http://purl.obolibrary.org/obo/MS_4000000 -->
 
     <owl:Class rdf:about="http://purl.obolibrary.org/obo/MS_4000000">