Probability of identifying a KIR-advantageous donor based on the number of donors who undergo confirmatory HLA typing for an individual patient. (A) Probability of identifying a KIR3DL1-Weak Inhibiting donor for HLA-C1⁺/HLA-Bw4⁺ recipients. (B) Probability of identifying a KIR2DS1⁺ (blue) or cenBB (red) donor for all HLA-C1⁺ recipients.