 In this study, deep sequencing was used to identify microRNAs, myrna's, in trifoliate orange, citrus trifoliator, a key rootstock of citrus. The study revealed 10 novel myrna's and 42 highly conserved myrna families, suggesting that specific myrna's exist in C. Trifoliator. Furthermore, these myrna's are likely to be involved in citrus growth, development and response to disease. This study provides valuable information about the presence of myrna's in trifoliate orange, which can help us better understand the molecular mechanisms underlying citrus growth and development. This article was authored by Yu-Ve-Ping, Korea Nicholas, Jong-Chang-Ching, and others.