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In contrast to white fat, brown fat is richly vascularized and has numerous unmyelinated nerves which provide sympathetic stimulation to the adipocytes. 和白色脂肪組織比較起來，棕色組織有充分的血琯浸潤，而且有許多無髓鞘的神經提供交感神經對脂肪細胞的刺激。