近年來，生物體的研究發展，已經從最基本的基因定序解碼，進一步的走向了解DNA、RNA和蛋白質之間的相互作用影響，也就是大家常聽到的系統生物學。系統生物學就是將DNA、RNA和蛋白質三者彼此之間的交互作用等資訊加以整合，並運用這些資料去建立數學計量模型，以期能掌握所有生物基因與組織間的關係及運作。生物網路相當複雜，彼此之間的可能組合個數也很多種，我們利用組合數學中的波利亞(Polya)計數定理，可以準確計算出多節點網路的所有可能組合個數，並研究那些生物網路中常見的模體其背後所隱藏的優勢，為何能在經過數十億年的不斷進化突變過程中，還依然能夠大量的存在生物網路中。

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