| gptkbp:instanceOf | gptkb:language 
 | 
                        
                            
                                | gptkbp:alternativeHomelandTheory | gptkb:Balkans gptkb:India
 gptkb:Anatolia
 gptkb:Armenian_Highlands
 
 | 
                        
                            
                                | gptkbp:date | 4500–2500 BCE 
 | 
                        
                            
                                | gptkbp:descendedFrom | gptkb:Albanian gptkb:Greek
 gptkb:Latin
 gptkb:Persian
 gptkb:Sanskrit
 gptkb:Assyrian
 gptkb:Old_English
 gptkb:Old_Irish
 gptkb:Old_Church_Slavonic
 gptkb:Tocharian
 Armenian
 all Indo-European languages
 
 | 
                        
                            
                                | gptkbp:era | Neolithic 
 | 
                        
                            
                                | gptkbp:extinct | yes 
 | 
                        
                            
                                | gptkbp:glottologCode | prot1241 
 | 
                        
                            
                                | gptkbp:ISO639-3 | ine-pro 
 | 
                        
                            
                                | gptkbp:languageFamily | gptkb:Indo-European_languages 
 | 
                        
                            
                                | gptkbp:notableFeature | free word order eight cases
 ablaut
 three grammatical genders
 complex inflection
 laryngeal consonants
 three numbers
 verbal aspect
 
 | 
                        
                            
                                | gptkbp:notableRoot | *déḱm̥t (ten) *h₁n̥gʷnis (fire)
 *h₁rudʰrós (red)
 *h₁éḱwos (horse)
 *h₂stḗr (star)
 *h₂ébōl (apple)
 *h₂éwis (sheep)
 *h₂éǵros (field)
 *h₃ekʷos (horse)
 *méh₂tēr (mother)
 *ph₂tḗr (father)
 *wódr̥ (water)
 
 | 
                        
                            
                                | gptkbp:proposedHomeland | gptkb:Pontic–Caspian_steppe 
 | 
                        
                            
                                | gptkbp:reconstructedVocabulary | yes 
 | 
                        
                            
                                | gptkbp:region | gptkb:Pontic–Caspian_steppe 
 | 
                        
                            
                                | gptkbp:restored | gptkb:linguist comparative method
 
 | 
                        
                            
                                | gptkbp:spokenIn | gptkb:Eurasia 
 | 
                        
                            
                                | gptkbp:writingSystem | none 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Indo-European gptkb:Indo-Aryan
 gptkb:Baltic_languages
 gptkb:Germanic_languages
 gptkb:Proto-Germanic
 
 | 
                        
                            
                                | gptkbp:bfsLayer | 5 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Proto-Indo-European 
 |