Zephrofel South Africa and then you can see that this is the top slice and the center slice and the bottom slice according to this figure over here and you can see that this is cylindrical in in structure and distribution right we also use different materials so this is an example where in this case you have a hollow core and then you have material type 1 and material type 1 in this case is just alginate material type 2 is collagen plus alginate we can change it to fibrin a fibrin and alginate as well that we use alginate as a structural material to hold the the hollow core up otherwise if you use other materials with just pure collagen or fibrin then they tend to collapse by themselves so you use a small amount of alginate mixed with fibrin and and collagen not
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