Since I don't have the specific content of that "piece," I can help you write it if you can tell me:
: This often looks like an abbreviation for a genus/species or a specific project database (e.g., Dendrobium or a specific DNA address protocol). Dnaddr.Yuan_P-11-22.4.var
Is it part of a or an "arg" (alternate reality game)? Since I don't have the specific content of
Is this for a (like a description of a genetic sequence)? Dnaddr.Yuan_P-11-22.4.var
: Almost certainly stands for "variant" or "variable," common in bioinformatics or programming.
Based on the structure, here is how that string is likely broken down: