ed ▁in ▁ur ine ▁are ▁partially ▁absor bed ▁by ▁ur ate ▁sed iments ▁( ▁sed iment um ▁lat rer ium ▁), ▁which ▁consists ▁of ▁cell ▁de br is ▁and ▁sed iment ed ▁ur inary ▁components ▁formed ▁when ▁the ▁acid ified ▁ur ine ▁is ▁stored ▁below ▁room ▁temperature . ▁These ▁ur ate ▁sed iments ▁looks ▁re dd ish ▁or ▁p ink ▁due ▁to ▁the ▁presence ▁of ▁a ▁main ▁p ig ment ▁first ▁introduced ▁by ▁Sim ons ▁in ▁ 1 8 4 2 ▁as ▁u ro ery th rin , ▁ ▁C lin ical ▁significance ▁▁ ▁From ▁early ▁clin ical ▁observations ▁it ▁is ▁known ▁that ▁u ro ery th rin ▁is ▁present ▁in ▁every ▁ur ine ▁and ▁increased ▁amounts ▁are ▁observed ▁in ▁path ological ▁states , ▁e . g . ▁met abol ic ▁dis orders ▁with ▁high ▁fe ver ▁or ▁t issue ▁de grad ation . ▁ ▁Chem ical ▁structure ▁▁ ▁The ▁chemical ▁structure ▁of ▁most ▁of ▁u ro chrom es ▁is ▁still ▁unknown , ▁since ▁they ▁are ▁very ▁lab ile ▁p ig ments ▁that ▁are ▁easily ▁decom posed ▁in ▁the ▁light . ▁In ▁particular ▁u ro ery th rin , ▁remains ▁un resol ved ▁until ▁ 1 9 7 5 ▁with ▁previous ▁papers ▁that ▁describes ▁it ▁like ▁a ▁pe pt id ic ▁comp ound . ▁In ▁ 1 9 7 5 ▁its ▁structure ▁was ▁described ▁based ▁on ▁mass ▁spect rom etry , ▁inf ra red ▁spect ro sc opy ▁and ▁nuclear ▁magnetic ▁reson ance . ▁ ▁References ▁▁ ▁Category : U r ine ▁Category