microorganisms and are more likely to float in the air a member of a family of proteins called life o'collins helps to protect calcium infection a notable source is county milk but it's not the only one on counts you're a night they could also spray the protein into the air or touches to dust particles kalle secrete different substances like milk can feed scenes but they year in is often overlooked as a possible source of life. even though it's excrete it in part as an aerosolized spray. the researchers take the particles they've collected to the lab for analysis they found that traditional livestock systems provide greater energy protection for humans than industrial scale enterprises. they therefore suspect that the dust found in regular farms contains particularly high levels of the protein. low and behold they do indeed find the precious protein in the samples from the cow shed. and it's a member of the lipid callen family stable so that also helps explain why we still find it in the cow shed just several weeks later that in turn means people are exposed to it for longer breathing it then