The sender did not provide you with that information? At any rate, why not transform bacteria and plate them on agar plates containing different antibiotics; Ampicillin, Kanamycin, and Chloramphenicol. These are commonly used antibiotics and most likely the plasmid vector in question would confer resistance to any one of them.
Thanks for the answers. I will try different antibiotics. I dont think is for CRISPR Polina, because seems to be an old construct that was used before for Xenopus? it is not clear for me. Anyway, Thank you all.
You could sequence the construct and then take the sequence that has been inserted in the construct and BLAST it. The BLAST results could show if there is known antibiotic resistance for that sequence.