تفاعل البوليميراز المتسلسل
Furthermore, different techniques have been developed to identify different "Trebouxia" strains within lichen thalli. Its rDNA (internal transcribed spacer regions recombinant DNA) sequence comparisons with the aid of Polymerase chain reaction (PCR) are easy and fast ways to identify different "Trebouxia" species that inhabit a thallus.