Serum-separating tube Serum-separating tube Serum-separating tubes, also known as serum separator tubes or SSTs, are used in medical clinical chemistry tests requiring blood serum. SSTs are sometimes called "marble-top tubes," "tiger-tops," or "gold-topped tubes", referring to the stoppers which are either gold, red with a gold ring on top, or marbled red and grey. Marble-top tubes are also referred to as "tiger-tops" in some clinics. SPS tubes have a paler colour, sometimes leading confusion; these are known as "yellow tops" not "gold". Trademarked versions include Covidien "Corvac" tubes. They contain a special gel that separates blood cells from serum, as well as
Blood, Sweat and Towers version by the full band, which was previously released as a single in 2005. It is one of only six UK top 50 singles to have the word "fuck" in the title. "Blood, Sweat and Towers" was released on three different dates, depending on location; Blood, Sweat and Towers Blood, Sweat and Towers is the debut album of English punk rock band the Towers of London, released on 5 June 2006. The album features thirteen tracks, four of which have been released in the United Kingdom as singles. The album was heavily influenced by Sex Pistols' "Never Mind the Bollocks"