Acertain food has a gluten ratio of 13\,\text{mg}13mg13, start text, m, g, end text of gluten per \text{l}lstart text, l, end text of the food. what is the gluten ratio in micrograms per milliliter \left(\dfrac{\mu\text{g}}{\text{ml} }\right)( ml μg )left parenthesis, start fraction, mu, start text, g, end text, divided by, start text, m, l, end text, end fraction, right parenthesis?