C11a

Could you specify the domain or context for C11a? It could refer to many different things (for example, a technical standard or component, a gene or protein designation, a product/model code, a geographic or organizational label, etc.). If you don’t have a specific domain in mind, I can draft a neutral, disambiguation-style stub that outlines the possible broad uses of alphanumeric designations like C11a, and you can tell me which one you want developed into a full article.