�������t¶��

Called the mesenchyme, this tissue contains cell layers that either stretch or pinch together.

In this complex metamorphosis, epithelial cells — the kind that stick together in sheets to form bodily tissues — are converted into loosely organized cells called mesenchyme.

Targeting signalling pathways that affect tumour mesenchyme have also yielded disappointing results thus far.

Figures of early stages in vertebral development by the authors mentioned show that the basidorsals chondrify first, as neural arches, while a separate mass of mesenchyme lies externally and ventrally from these.

In Annelids with trochosphere larvae a certain amount of mesenchyme is formed at an earlier 319 stage and gives rise to the muscular bands of the young larva.