The skin at the base of the neck : mucous membranes of the nose you may stop nose - bleed by placing cold towel on the back of the neck 颈下部皮肤：鼻腔粘膜在颈背部位敷冷毛巾可以止流鼻血。
2.
Methods subacute senile mouse model was established by injection of d - galactose . the splenic cells were isolated from mice and cultured in vitro following cona stimulation . expression of cd 137 on splenic t cells in the model and normal control groups were compared with each other by flow cytometry method at various cultural times after cona stimulation 方法取5周龄balb c雄性小鼠，颈背部皮下注射d -半乳糖，分别于造模型后一到五个月取脾脏淋巴细胞，同时取自然衰老小鼠脾脏淋巴细胞，在培养的第0 、 24 、 48 、 72 、 96 、 120 、 144h收集细胞，用流式细胞仪分析脾脏t细胞cd137的表达阳性率。
