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光镜下长吻鮠外周血中可区分出红细胞、中性粒细胞、单核细胞、淋巴细胞和血栓细胞,未见嗜酸性粒细胞和嗜碱性粒细胞,其中,红细胞数量最多,其次是血栓细胞和淋巴细胞,单核细胞和中性粒细胞数量最少;同时还发现幼稚红细胞、直接分裂的红细胞.电镜下,个别红细胞可见到少量线粒体;中性粒细胞表面有短而钝的伪足样突起,颗粒有3种类型;单核细胞内有较多的溶酶体样颗粒;小淋巴细胞有细长的伪足样突起,大淋巴细胞内质网丰富.细胞化学染色显示:所有白细胞PAS反应呈阳性;SBB染色只有嗜中性粒细胞呈阳性;单核细胞及嗜中性粒细胞和个别淋巴细胞中含有ACP,只有粒细胞含有POX;单核细胞、嗜中性粒细胞均含有ANAE,部分淋巴细胞含有ANAE.
Under the light microscope, the erythrocytes, neutrophils, monocytes, lymphocytes and thrombus cells can be distinguished from the peripheral blood of long-nosed 吻 鮠, no eosinophils and basophils were found, of which the number of erythrocytes was the highest, followed by Thrombocytes and lymphocytes, monocytes and neutrophils in the smallest number; also found that immature erythrocytes, red blood cells directly divided.Electron microscope, a few red blood cells can see a small amount of mitochondria; neutrophil surface with short and blunt pseudopodia Like protuberances, there are three types of granules; monocytes have more lysosome-like particles; small lymphocytes have elongated pseudopodia-like protrusions, large endoplasmic reticulum rich in lymphocytes.Cytochemical staining showed that: all white blood cells PAS reaction was positive; SBB staining only neutrophil positive; mononuclear cells and neutrophils and individual lymphocytes contain ACP, only granulocytes contain POX; mononuclear cells, neutrophils contain ANAE, some lymphocytes contain ANAE.