Doctors Seek to Regrow Parts of Fingers

Doctors at a Texas military base are testing a procedure on wounded Iraq veterans that may allow them to regrow portions of lost fingers. The procedure involves treatments with a fine powder called extracellular matrix, which is taken from the bladders of pigs. The substance is what cells latch on to in mammals to allow them to divide and grow into tissue. Scientists who developed the procedure say the substance appears to activate latent biological processes in humans that encourage healing and tissue regeneration. They said the processes are active in human fetuses, which have the ability to regenerate and grow new parts, but the ability becomes dormant after birth