1. Ultrastructure and differentiation of ascidian muscle

   • Michael J. Cavey
   • Richard A. Cloney

   OriginalPaper Pages: 289 - 313

2. Silicon-containing granules of rat liver, kidney and spleen mitochondria

   • Charles W. Mehard
   • Benjamin E. Volcani

   OriginalPaper Pages: 315 - 327

3. Autoradiographic study on the localization of estradiol-17β in neonatal mouse uterus and cervix

   • Arne Eide
   • Tor Magne Fossberg

   OriginalPaper Pages: 329 - 337

4. The caudal neurosecretory system

   • Daniel K. O. Chan
   • Howard A. Bern

   OriginalPaper Pages: 339 - 354

5. On the fine structure of the electrocyte of Electrophorus electricus L.

   • Raul Dodsworth Machado
   • Wanderley de Souza
   • Gustavo de Oliveira Castro

   OriginalPaper Pages: 355 - 366

6. Subsarcolemmal mitochondria and capillarization of soleus muscle fibers in young rats subjected to an endurance training

   • W. Müller

   OriginalPaper Pages: 367 - 389

7. Hypothalamic and hormonal control of the photoperiodically induced vernal functions in the White-crowned Sparrow, Zonotrichia leucophrys gambelii

   • Katsuhiko Yokoyama

   OriginalPaper Pages: 391 - 416

8. Localization of K⁺-Stimulated p-NPPase in the lachrymal ‘Salt’ gland of Malaclemys, using cytochemical and autoradiographical techniques

   • I. G. Thompson
   • F. B. M. Cowan

   OriginalPaper Pages: 417 - 426

9. Relationship between the chromatoid body and the acrosomal system in early spermatids of Myxine glutinosa L.

   • Ingrid Alvestad-Graebner
   • Hans Adam

   Short Communication Pages: 427 - 430

10. Structural changes occurring during atreasia in sheep ovarian follicles

    Erratum Pages: 431 - 431