Translate the following English sentence to French:
"Their research laboratories, which long ago became ivory towers, are increasingly surrounded by the business offices which are proliferating in this new biological El Dorado between knowledge and profit."
Leurs laboratoires de recherche, longtemps des tours d' ivoire, sont de plus en plus entourés... de bureaux d' affaires qui prolifèrent dans ce nouvel Eldorado de la biologie, entre savoir et profit.