likely refers to Rear (as in "Rear right" or "Rear left" window trim).
In genetics and neuroscience research, is the ID for a specific transgenic line from the Bloomington Drosophila Stock Center (BDSC 52110). 52110 rar
might refer to a section of a research paper—specifically the "Writing - original draft" portion—where results involving this specific gene or neuron type (like bsgRNAi ) are discussed. likely refers to Rear (as in "Rear right"