G-banding pattern of the stemline chromosomes of the Usubuchi sarcoma around the 2000th transfer generation was described with special reference to marker chromosomes. In the course of serial transfers, two major stemlines with the marker combinations, 1-2-3-4
1-4
3-8 and 2-3-4
1-4
2-4
3-8, alternatively contributed to the growth of this tumor. Various types of sublines were observed in the US cells examined: G-band analysis suggested that they might have been derived from the major stemline, 2-3-4
1-4
2-4
3-8.
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