Photograph of metamorphosis of Aurelia aurita (Scyphozoa, Cnidaria), where the sessile polyp transforms into several free floating medusae. Metamorphosis starts at the apical pole of the animal, the polypÎs head, by segmentation into repetitive constrictions and proceeds down the body column. One segment develops into one medusa. From the basal to the apical end the photograph shows a developmental gradient, where formation of constrictions precedes the development of young medusae. Note that only the head of the former polyp is still under reorganisation into a medusa.
For details see "Induction of segmentation in polyps of Aurelia aurita (Scyphozoa, Cnidaria) into medusae and formation of mirror-image medusa anlagen" by Kroiher et al. in this issue pp. 485-490.
Int. J. Dev. Biol. (2000) 44: 429-442
Int. J. Dev. Biol. (2000) 44: 443-450
Int. J. Dev. Biol. (2000) 44: 451-456
Stage-dependent responses of the developing lung to retinoic acid signaling.
Int. J. Dev. Biol. (2000) 44: 457-462
Retinoid signalling acts during the gastrula stages to promote primary neurogenesis.
Int. J. Dev. Biol. (2000) 44: 463-470
Heat shock factor 2 is activated during mouse heart development.
Int. J. Dev. Biol. (2000) 44: 471-477
Expression of the cardiac actin gene in axolotl embryos.
Int. J. Dev. Biol. (2000) 44: 479-484
Int. J. Dev. Biol. (2000) 44: 485-490
Int. J. Dev. Biol. (2000) 44: 491-498
Int. J. Dev. Biol. (2000) 44: 499-506
Int. J. Dev. Biol. (2000) 44: 507-510