Screening for carriers of Tay-Sachs disease among Ashkenazi Jews. A comparison of DNA-based and enzyme-based tests
B. L. Triggs-Raine and Others
Abstract  

Differences in the quality of semen in outdoor workers during summer and winter
R. J. Levine and Others
Abstract  

Systemic exposure to mercaptopurine as a prognostic factor in acute lymphocytic leukemia in children
G. Koren and Others
Abstract  

Abnormal endothelium-dependent vascular relaxation in patients with essential hypertension
J. A. Panza, A. A. Quyyumi, J. E. Brush, and S. E. Epstein
Abstract  

Regulatory functions of the vascular endothelium
J. R. Vane, E. E. Anggard, and R. M. Botting
 

Mitochondrial myopathy with a defect of mitochondrial-protein transport
A. H. Schapira and Others
 

Statement from the National Institutes of Health workshop on population screening for the cystic fibrosis gene
 

Fewer sperm in the summer--it's not the heat, it's..
P. J. Snyder
 

New "Information for Authors" and readers
A. S. Relman
 

High blood alcohol levels in women
 

Mutation analysis in cystic fibrosis
 

Vasovagal syncope in a heart-transplant recipient
P. F. Semple
 

No rationale for finger-stick blood sampling
S. L. Grenell
 

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