the elec tron micrograph showed that the membrane ofost eobl asts was stained strongly positive by ALP,butnegtive in cytoplasm, nuclear membrane, endoplasmicreticulum and mitochondrioa.

• （3）ALP染色后的电镜观察显示，细胞膜的AnP染色呈强阳性，而核膜、线粒体及内质网等细胞器及胞质的染色均为阴性。