In 1885, Wilhelm Roux laga saaro qayb ka mid ah saxan medullary ee digaag uurjiifka ah oo ay sii wadaan in xal cusbo kulul dhowr maalmood, aasaasidda mabda'a dhaqanka unugyada. Ross Granville Harrison, ka shaqeeya Johns Hopkins Medical School iyo ka dibna at Yale University, daabacay natiijada tijaabooyinka uu ka 1907 si 1910, aasaasidda habka dhaqanka unugyada. farsamooyinka dhaqanka Cell si weyn u horumariyey ee 1940 iyo 1950 si ay u taageeraan cilmi-baarista ee cilmiga fayraska.
1940kii iyo 1950kii