Gravitational aggregations clustered into filaments, leaving voids in the gaps. Humphead wrasses likely do not travel very far for their spawning aggregations. Fish aggregations can be structured or unstructured. Most Antarctic penguin species nest in large high density aggregations of birds. Mutant SOD1 protein forms intracellular aggregations that inhibit protein degradation. It has support for table joins, groupings, aggregations and functions. Here, the fishes spawn in large aggregations. Groups of kangaroo rats that exist are aggregations and colonies. Atlantic cod are a shoaling species and move in large, size-structured aggregations. The droplets disperse evenly, evaporate rapidly and display reduced flake aggregations. They also tend to spawn in large aggregations, returning annually to the same locations. There is distinct genetic differentiation between aggregations. These aggregations consist primarily of younger animals. They may be composed of abnormal aggregations of arterioles, capillaries or venules. Small sludge granules begin to form whose surface area is covered in aggregations of bacteria.