In horse racing, these definitions may differ: For example, in the British Isles, Thoroughbred horse racing defines colts and fillies as less than five years old. However, Australian Thoroughbred racing defines colts and fillies as less than four years old.
For the general concept of brain plasticity, see neuroplasticity. In neuroscience, synaptic plasticity is the ability of synapses to strengthen or weaken over time, in response to increases or decreases in their activity. Plastic change also results from the alteration of the number of neurotransmitter receptors located on a synapse.
Dysplastic (atypical, Clark) melanocytic nevi are acquired pigmented melanocytic proliferations of the skin with distinct clinical and histologic features. In the appropriate clinically setting dysplastic (atypical, Clark) melanocytic nevi are cutaneous markers for the development of familial and nonfamilial melanomas.ysplastic (atypical, Clark) melanocytic nevi may be considered intermediate lesions of tumor progression, as approximately 30% of melanoma arise in association with a precursor nevus, most commonly a dysplastic nevus.