Continue this process with sets of three pods until there are several clusters of pods tied to the cotton string, or until the weight of the pods makes the string difficult to handle. (fieryfoodscentral.com)
Canine compulsive disorder has several clusters of symptoms, and not all symptoms are evenly spread across dog breeds. (wagwalking.com)
Hox genes are arranged in several clusters, and their order and spacing within the clusters — which varies little between insects and humans — turns out to be central to the way they work. (newscientist.com)