Final answer:
The hash marked tube in the context provided likely refers to a medical specimen collection tube, which upon analysis, was found to contain 23 amino acids among other organic molecules.
Step-by-step explanation:
The question refers to the contents of a hash marked tube which is commonly used in medical or laboratory settings.
Such tubes typically contain certain additives to stabilize and preserve the samples contained within them for analysis.
However, the details provided in the question seem to hint at an experiment where the tubes' contents, when analyzed with newer detection techniques, revealed additional organic molecules not previously detected.
Specifically mentioned are the presence of 23 amino acids discovered in the analysis of these tubes.