[Differential staining of the chromosomes in transplanted ascites tumors in mice (in connection with the discussion on the existence of the NK/Ly strain)].

When studying the Q-, G-, and C-bands, the character of acrocentric chromosomes' bands was found to be varying even within the same tumor. However, the bands of the markerchromosomes A and B coincide in NK/Ly and in the Ehrlich--Lettres tumors. With the aid of staining for revealing C-bands, the acrocentric markers "cc" and "ac" common for both tumors, were first noted. This corroborates the opinion of the replacement of NK/Ly by the Ehrlice-Lettres tumor.