diff --git a/perspectives/physicalistic.ttl b/perspectives/physicalistic.ttl
index 605dddb0..821a6e35 100644
--- a/perspectives/physicalistic.ttl
+++ b/perspectives/physicalistic.ttl
@@ -112,8 +112,7 @@ spin 2: O15 in ground state."""@en ;
 
 ###  https://w3id.org/emmo#EMMO_21205421_5783_4d3e_81e5_10c5d894a88a
 :EMMO_21205421_5783_4d3e_81e5_10c5d894a88a rdf:type owl:Class ;
-                                           rdfs:subClassOf :EMMO_5b2222df_4da6_442f_8244_96e9e45887d1 ,
-                                                           :EMMO_8b1367d6_0133_4b56_acc1_fa8b058169e3 ;
+                                           rdfs:subClassOf :EMMO_32f55395_8b94_40de_a103_bffa5c121d98 ;
                                            rdfs:isDefinedBy "https://goldbook.iupac.org/terms/view/M03986"@en ;
                                            skos:altLabel "ChemicalEntity"@en ;
                                            skos:example "Hydrogen molecule is an adequate definition of a certain molecular entity for some purposes, whereas for others it is necessary to distinguish the electronic state and/or vibrational state and/or nuclear spin, etc. of the hydrogen molecule."@en ,
@@ -165,7 +164,8 @@ spin 3/2: He5 in ground state, Delta baryons (excitations of the proton and neut
                                                                                     ) ;
                                                                  rdf:type owl:Class
                                                                ] ;
-                                           rdfs:subClassOf <http://w3id.org/emmo#EMMO_41cecfc2_bb6b_45f3_b6cc_e7740d931afe> ;
+                                           rdfs:subClassOf <http://w3id.org/emmo#EMMO_41cecfc2_bb6b_45f3_b6cc_e7740d931afe> ,
+                                                           :EMMO_8b1367d6_0133_4b56_acc1_fa8b058169e3 ;
                                            skos:prefLabel "ParticulateMatter"@en ;
                                            :EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9 "Bounded matter."@en .
 
@@ -289,8 +289,7 @@ Antimatter is a subclass of matter."""@en ;
 
 ###  https://w3id.org/emmo#EMMO_7b42954f_0b91_4b3a_a65e_2470202cf548
 :EMMO_7b42954f_0b91_4b3a_a65e_2470202cf548 rdf:type owl:Class ;
-                                           rdfs:subClassOf :EMMO_5b2222df_4da6_442f_8244_96e9e45887d1 ,
-                                                           :EMMO_8b1367d6_0133_4b56_acc1_fa8b058169e3 ;
+                                           rdfs:subClassOf :EMMO_32f55395_8b94_40de_a103_bffa5c121d98 ;
                                            <http://w3id.org/emmo#EMMO_8a137e9f_579c_4e28_baca_e8980eb0c3db> "EquivalentTo: Baryon or Meson" ;
                                            skos:prefLabel "Hadron"@en ;
                                            :EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9 "Particles composed of two or more quarks."@en ;
@@ -434,8 +433,7 @@ We cannot say that H₂ molecule has direct part two H atoms, but has direct par
 
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 :EMMO_f835f4d4_c665_403d_ab25_dca5cc74be52 rdf:type owl:Class ;
-                                           rdfs:subClassOf :EMMO_5b2222df_4da6_442f_8244_96e9e45887d1 ,
-                                                           :EMMO_8b1367d6_0133_4b56_acc1_fa8b058169e3 ;
+                                           rdfs:subClassOf :EMMO_32f55395_8b94_40de_a103_bffa5c121d98 ;
                                            <http://w3id.org/emmo#EMMO_8a137e9f_579c_4e28_baca_e8980eb0c3db> "SubClassOf: hasPart some Nucleon" ;
                                            skos:prefLabel "Nucleus"@en ;
                                            :EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9 "The small, dense region at the centre of an atom consisting of protons and neutrons."@en .