[Primary cultured neonate rat sinus node cells: morphology and expression of kir2.1 protein].

Objective: To investigate the expression of kir2.1 protein in primary cultured sinus node cells and establish a reliable technique to locate, culture and characterize neonatal rat sinus node cells.

Methods: In paraffin sections, the location and morphology of the neonatal rat sinus node cells were observed by HE staining, silver nitrate staining, myelin staining and phosphotungstic acid-hematoxylin (PTAH) staining.