最近上课，老师给了篇nature的paper，完全看不懂，对这方面没什么了解，谁能帮忙看一下这个图是怎么做出来的？说明了一个什么问题？R2 又是什么意思呢？？？
a, Clustering of functional profiles based on the relative abundance of KEGG metabolic pathways. All pairwise comparisons were made of the profiles by calculating each R2 value. Sample identifier nomenclature: family number, twin number or mother, and BMI
category (Le, lean; Ov, overweight; Ob, obese; for example, F1T1Le stands for family 1, twin 1, lean).
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