First called "nucleolar accessory bodies" in 1903, they're also known as "coiled bodies."
These suborganelles contain U7RNA involved in histone RNA processing, and the naming of SMN "Gems" refers to these. First called "nucleolar accessory bodies" in 1903, they're also known as "coiled bodies." FTP, give these bodies named for a Nobel-winning Spanish physiologist. 
These suborganelles contain U7RNA involved in histone RNA processing, and the naming of SMN "Gems" refers to these.
Cajal bodies (take "coiled bodies" or CBs before mention of "coiled")