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Fig. 3. Principal component analysis of inbred lines extracted from heterotic group A (Pop21, 22, 29, 49, and Pool 24), {square}; heterotic group B (Pop32), {blacksquare}; heterotic group C (Pop25), {blacktriangleup}; and heterotic group D (Pop43), {diamondsuit}. CML247 (*) and CML254 (+) were used as testers in the development of inbred lines. PC1 and PC2 are the first and second principal components, respectively.