Mucous is the adjectival form of the more familiar noun, mucus. In other words, mucous is actually the action or ability to make the yucky stuff we blow into tissue, which is mucus. There are mucous cells, mucous fluid, mucous membranes, and mucous glands. They are all different objects that can secrete mucus.
  Thus, if you have business income, you can contribute to your ROTH IRA if you are eligible and a SEP IRA. If your SEP IRA is likely to become substantial or you have funds in a 401(k) from a previous employer and you are an one person (or one person with a spouse) business, you should look into individual 401(k)s.
You can only contribute to your SEP IRA for the previous year if you haven't already maxed out your contributions. For employee contributions, the limit is the same as the traditional and Roth IRA limits -- $5,500 if you're under 50 and $6,500 if you're 50 and older as of 2013.