'Our comprehensive genomic survey revealed that 14 to 40 kbp long DNA viruses of the Polinton-like supergroup are frequent inhabitants of diverse protist genomes. Moreover, our finding of thousands of endogenous viruses in one-third of all sequenced protist genomes may still be a conservative estimate.'

#Virology

https://www.pnas.org/doi/10.1073/pnas.2300465120#sec-2