Yes, it is indeed possible to invest in Janus funds through a retirement account. Many retirement accounts, such as Individual Retirement Accounts (IRAs) and employer-sponsored plans like 401(k) or 403(b) plans, often allow an array of mutual funds, including those offered by Janus Capital Group Inc. However, the specific funds that are available for investment can vary depending on the retirement plan provider and the specific plan options. It is important to review the investment choices within your retirement account to see if Janus funds are included in those options. Additionally, for the most accurate and detailed information, it may be helpful to refer to the current web page for specifics related to investment opportunities and retirement accounts.