• Returns the length of the given entity:
        * Gene: length in nucleotides (including stop codon)
        * Protein: length in amino acids
        * Contig: length in nucleotides
        * Organism: sum of length of all contigs
        * string: length of string
• If the entity is a list, the lengths of the components of the list are returned, not the length of the list
  (use LENGTH if you want the length of a list)
• Gene, protein, contig, and organism may be specified as a frame, string, symbol, or bare word

Example:
  (LENGTHS-OF (PROTEINS-OF S6803))

          [Result is a list consisting of the length of each protein of Synechocystis PCC6803]

Example:
  (LENGTH-OF ssrA IN A7120)

          [Result is the length of the ssrA gene, specifically the one in Anabaena PCC7120]

  (LENGTHS-OF (REPLICONS-OF Npun))

          [Result is a list consisting of the length of each replicon of Nostoc punctiforme]