Database of nucleotids - weigths included
$id : integer
$letter : string
$complement : string
$nature : string
$weight : float
getId() : integer
setId(integer $id)
getLetter() : string
setLetter(string $letter)
getComplement() : string
setComplement(string $complement)
getNature() : string
setNature(string $nature)
getWeight() : float
setWeight(float $weight)