STRUCTURE plot using the 18 SNP markers associated with resilience to bonamiosis in the sampled individuals from seed produced with pre-screened broodstock from a long-term affected area by RvY and the seed produced with broodstock from a naïve area by NIOZ collected during the challenge test in April. Each vertical bar represents one individual, and the colour proportion for each bar/individual represents the posterior probability of its assignment to the different clusters (K) inferred by the program. Individuals pertaining to these two clusters, “orange” and “blue”, showed most of them a full “orange” or “blue” constitution, and further, they appeared intermingled in both samples at very different frequencies.