In January 2021, it was announced that ZeptoMetrix Corporation had been acquired by Cole-Palmer LLC - a developer of specialized lab and industry products. The deal wasorchestrated through that firm's backer - GTCR LLC is a private equity firm focused on leveraged buyout, leveraged recapitalization, growth capital and rollup transactions. Zeptometrix (ZMC) has functioned since 1982 as a fully integrated biotechnology facility manufacturing and distributing products for the research and biotechnology communities - having laboratories at the Roswell Park Cancer Institute enabling collaboration with scientists within the Institute on new product R&D. The firm manufacture of cytokines, cytokine support products, antibodies and AIDS testing kits for research. The cytokines produced include human platelet-derived growth factors, lymphokine recombinant human interleukin-2 (rIL-2), human T-cell growth factors (interleukin-2) and human immune interferons (Gamma IFN). The cytokine support products include gentamicin sulfate, a leukocyte isolation agent and scrubbed nylon fibers for separating leukocytes from peripheral blood. Originally - in July 1999 - Cellular Products, Inc. was purchased by ZeptoMetrix Corporation, a newly formed company established by the former management of Cellular Products, Inc.