Preface to the Fourth Edition 



Acquisition of cell cultures by the Repository and shipment 

 of cell cultures to investigators both continue to increase 

 at an accelerating rate as shown on the graph which follows 

 this preface. In addition to many new cell cultures and 

 supplementary data on others, the present edition contains 

 new features. McKusick's numbers, where applicable, are 

 inserted immediately following the name of each disease. 

 A bracket is placed around cell cultures from members of a 

 family group. HL-A antigens have been determined on many 

 of the lymphocyte cell cultures and this data is recorded 

 in the table on pages 161-163. Eleven cultures are avail- 

 able from both this Repository and from the American Type 

 Culture Collection in Rockville, Maryland under a different 

 numerical designation. To avoid confusion we have listed 

 the ATCC designation under "Remarks". 



Camden, N.J., August 1977 Lewis L. Coriell, M.D, Ph.D. 



Arthur E. Greene, D.Sc. 



