Mouse BALB/c testis, Leydig cell. Originated from primary cultures of Leydig cell enriched preparations from normal testes of 11-13 day old BALB/c nu/ mice. Characteristics similar to primary cultures of Leydig cells. Responds to leuteinising hormone but not FSH. In the presence of LH the cells are capable of metabolising cholesterol. These cells are non-tumourigenic.