Figure 3.

Updated nomenclature of SEVA vectors. The figure sketches the rules for naming each of the 4 positions available for shaping a complete SEVA code. Each of them is assigned to a code of four unequivocal positions in an alphanumeric cipher: The first position is for the antibiotic resistance. For the second position, the first nine origins of replication receive a sole numeric code 1 to 9 beyond which a capital letter will be added to ‘9’, starting with an A (9A) and following with 9B, 9C etc. In case of either variants or addition(s) of a second replication origin, a lower case letter is then added. The third position, each cargo is assigned a sole ordinal numeric code 1 to n (n being unlimited). Finally, the fourth position is for the gadgets, which are designated by lower case Greek letters (α to ω).