In the naming of restriction enzymes, the first letter is derived from $...A...$ name, the next two letters from the $...B...$, and the fourth letter from $...C...$ of $...D...$ where the enzymes are extracted.
$A$ to $D$ in the statement can be:

  • A
    $(A)-$Genus, $(B)-$species, $(C)-$strain, $(D)-$bacteria
  • B
    $(A)-$Species, $(B)-$genus, $(C)-$strain, $(D)-$bacteria
  • C
    $(A)-$genus, $(B)-$Species, $(C)-$variety, $(D)-$eukaryote
  • D
    $(A)-$Species, $(B)-$genus, $(C)-$variety, $(D)-$eukaryote

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