It's likely those cell lines were used for the experimental vaccine serum of the Hepatitis B vaccine, which was injected into gay men in cities across the US. Cities where the clinical trials of the Hep B vaccines were conducted coincidentally became "epi-centers" of HIV/AIDS at the beginning of the epidemic.
Dr. Maurice Hilleman admitted that he illegally imported the monkeys that carried HIV for his polio research. Excellent summary here. . .
https://fromthearchivesresearchingservices.wordpress.com/2020/06/26/censored-interview-merck-dr-admits-he-imported-monkeys-used-for-polio-vaccinations-that-caused-aids-listeners-laughs/
It's likely those cell lines were used for the experimental vaccine serum of the Hepatitis B vaccine, which was injected into gay men in cities across the US. Cities where the clinical trials of the Hep B vaccines were conducted coincidentally became "epi-centers" of HIV/AIDS at the beginning of the epidemic.