Given the task definition and input, reply with output. In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

Here , we analyzed the interaction of CYT - 18 with a small RNA ( P4 - P6 RNA ) corresponding to the isolated P4 - P6 domain of the N . crassa mitochondrial large subunit ribosomal RNA intron .
CYT - 18