Mulasarvastivada

Mulasarvastivada (Skt. mūlasarvāstivāda; Tib. གཞི་ཐམས་ཅད་ཡོད་པར་སྨྲ་བའི་སྡེ། , Wyl. gzhi thams cad yod par smra ba'i sde), literally the original Sarvastivada, a term thought to have been used as a self-identification by a group within the wider Sarvastivadin tradition initially clustered around Mathura and regions to its northwest. If this really was a sub-school, little else is known of it apart from its distinct corpus of vinaya literature—the largest of the several vinaya corpora still extant and the only one that has been preserved in Tibetan.]].