Introduction: evaluating the benefits and potential risks of disinfectants in drinking water treatment.

In vitro cultures of human bone marrow have been used to study normal haemopoiesis and to gain information to aid in the treatment of leukaemia patients. A workshop on the development of semi-solid bone marrow cultures was held for two days in Washington on 15 and 16 August 1976. The participants of this workshop discussed some of the technical problems associated with semi-solid cultures of human marrow, and described methods for obtaining reliable sources of exogenous granulocyte macrophage colony-stimulating factor (GM-CSF)* for human cells. The following report was compiled by the rapporteur from all the oral presentations made at the workshop.