Hyaluronidase, the fundamental cause of foetal growth.

Following a recently published theory, in which the fundamental role of hyaluronidase in relation to cell metabolism was proposed, an explanation is given for the extremely rapid growth of the developing foetus. This may be due to a special function of the placental hyaluronidase synthesis. A placental hyaluronidase cycle will be described. This placental hyaluronidase synthesis and its suggested cycle explains not only the possibility of the rapid foetal development but at the same time a number of maternal physiological changes as well as the increasing rate of metastasis of malignant processes during pregnancy. Also an explanation is given for the development of the juvenile pulmonary distress syndrome in premature babies.