When a baby is developing, how do the different parts of it’s body know what they are? A little finger and a thumb are

When a baby is developing, how do the different parts of it’s body know what they are? A little finger and a thumb are made up of exactly the same cells, e.g. blood cells, bone cells etc, but what makes the little finger a different shape to the thumb?

Posted on June 22, 2015 by in Question. Comments Off on When a baby is developing, how do the different parts of it’s body know what they are? A little finger and a thumb are