 Traditional algorithms simply consider strong protein complexes that can be found in the original network by optimizing some metric, which may cause obstacles for the discovery of weak and hidden complexes that are overshadowed by strong complexes. Additionally , protein complexes not only have different densities but also a various range of scales, making them extremely difficult to be detected.
<clarity>  Traditional algorithms simply consider strong protein complexes that can be found in the original network by optimizing some metric, which may cause obstacles for the discovery of weak and hidden complexes that are overshadowed by strong complexes. Additionally , protein complexes not only have different densities but also a various range of scales, making them extremely difficult to be detected.
 Traditional algorithms simply consider strong protein complexes that can be found in the original network by optimizing some metric, which may cause obstacles for the discovery of weak and hidden complexes shielded by stronger complexes. Also , protein complexes not only have different densities but also a various range of scales, making them extremely difficult to be detected.