1. Announcement

   Announcement Pages: i - i

2. Properties of placental alkaline phosphatase. III. Thermostability and urea inhibition of isolated components of the three common phenotypes

   • Nicholas G. Beratis
   • Kurt Hirschhorn

   OriginalPaper Pages: 1 - 8

3. A study of genetic polymorphisms of milk β-lactoglobulin, α_S1-casein, β-casein, and κ-casein in five dairy breeds

   • Francis H. F. Li
   • Stanley N. Gaunt

   OriginalPaper Pages: 9 - 20

4. Lesch-Nyhan syndrome: Absence of the mutant enzyme in erythrocytes of a heterozygote for both normal and mutant hypoxanthine-guanine phosphoribosyl transferase

   • John A. McDonald
   • William N. Kelley

   OriginalPaper Pages: 21 - 26

5. Heterogeneity in CsCl buoyant densities of chiropteran DNA

   • Frances E. Arrighi
   • William Z. Lidicker Jr.
   • Janet Bergendahl

   Note Pages: 27 - 30

6. Aromatic amino acid metabolism in brindled (Mo ^br) and viable-brindled (Mo ^vbr), two alleles at the mottled locus in the mouse

   • D. M. Hunt
   • D. R. Johnson

   OriginalPaper Pages: 31 - 40

7. Redundant DNA of Neurospora crassa

   • Robert R. Brooks
   • P. C. Huang

   OriginalPaper Pages: 41 - 49

8. Screening tests for argininosuccinic aciduria, orotic aciduria, and other inherited enzyme deficiencies using dried blood specimens

   • William H. Murphey
   • Linda Patchen
   • Robert Guthrie

   OriginalPaper Pages: 51 - 59

9. Seminal vesicle protein in rats: A gene in the fourth linkage group determining electrophoretic variants

   • David L. Gasser

   Note Pages: 61 - 63

10. The number and activity of ribosomal RNA genes in Xenopus laevis embryos carrying partial deletions in both nucleolar organizers

    • Leo Miller
    • John Knowland

    OriginalPaper Pages: 65 - 73

11. Alkaline phosphatase of Drosophila melanogaster. I. Partial purification and characterization

    • Robert A. Harper
    • F. B. Armstrong

    OriginalPaper Pages: 75 - 82

12. Morphogenic effects of halogenated thymidine analogues on Drosophila. I. Quantitative analysis of lesions induced by 5-bromodeoxyuridine and 5-fluorouracil

    • T. M. Rizki
    • R. M. Rizki
    • H. A. Douthit

    OriginalPaper Pages: 83 - 97