L1210 cells
L1210 is a mouse lymphocytic leukemia cell line which is derived from the ascitic fluid of 8-month-old female DBA/2 strain mice. While they are lymphocytic B-cells they are more like lymphoblasts in morphology, develop massive tumours in nude mice after a latent period of 7-10 days. References

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Cellosaurus entry for L1210

Rodent cell lines
Lymphocytes