text: user10083: Sorry if this question is obvious - I'm not familiar with proteomics so I'm not sure of the standard units.
  In this paper, it talks about using the length of a protein to calculate the NSAF value.  However, it doesn't specify the units.  Would it be peptides, amino acids or nucleic acids? Or something else?
  
  user77: As mentioned by others, it's the number of amino acids. Alternative measurements could be in Angstroms or similar, but that would require at least an approximate structure.
  
original_text: 10083: <p>Sorry if this question is obvious - I'm not familiar with proteomics so I'm not sure of the standard units.</p>
  <p><a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2805705/" rel="nofollow noreferrer">In this paper</a>, it talks about using the length of a protein to calculate the NSAF value.  However, it doesn't specify the units.  Would it be peptides, amino acids or nucleic acids? Or something else?</p>
   77: <p>As mentioned by others, it's the number of amino acids. Alternative measurements could be in Angstroms or similar, but that would require at least an approximate structure.</p>
  