Thirty research groups participated in the first CAFA, presenting a total of 54 algorithms. The results are published in an article in Nature Methods. The researchers participated in blind-test experiments in which they predicted the function of protein sequences for which the functions are already known but haven't yet been made publicly available. Independent assessors then judged their performance. The challenge organizers explain that: 'The accurate annotation of protein function is key to understanding life at the molecular level and has great biochemical and pharmaceutical implications, explain the study authors; however, with its inherent difficulty and expense, experimental characterization of function cannot scale up to accommodate the vast amount of sequence data already available.The computational annotation of protein function has therefore emerged as a problem at the forefront of computational and molecular biology.'