Final answer:
The tubes that were initially reported as containing no additives were found to actually contain 23 amino acids.
Step-by-step explanation:
The tubes that contain no additives are those that were analyzed and shown to contain additional organic molecules, such as 23 amino acids. These tubes were originally reported as lacking additives, but the newer detection techniques revealed the presence of these organic compounds. This finding was discussed in the article titled 'Surprise Goodies in the Soup!'.