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Touch my toes!!! I can't even see the bloody things!!!
Yes, there is a great range of natural laxity. It is genetically determined and relates to the instructional programs (from the genetic database) which determine the collagen structure. In simple terms: is the fabric woven into an 'open' or 'more closed' cofiguration.External input into the structure, i.e influences upon collagen after it has been formed can and do modify it. Plasticity in the same sense as "neural plasticity".