I am using data from the tabula muris consortium. There are some specific genes with name ending with suffix 'rik' (e.g. You might be able to use org.mm.eg.db to map them to aliases.
I was struggling to use annotationdbi to change my ensemble id to gene name, for datasets of three different species (human, canine, mouse). Q&a for researchers, developers, students, teachers, and end users interested in bioinformatics Searching online i found that they are from riken project.
These look like mouse gene identifiiers. There should be a way to use biomart as well, but i don't know the. There are some specific genes with name ending with. You say you have human gene symbols in your text, but in your code you say you are filtering by mgi symbols.