how to build part of tree in matlab from vectors of parents and children

Hi all,

Can any one tell me how to begin building a code in matlab for making a part of tree POT system of genes (GO Ontology)... I already have built a matlab code that finds the cell array that contains the parents and chaildren vectors as the following:

       Parents:     children:
      'GO:0006412' 'GO:0030533'
      'GO:0006810' 'GO:0003774'
      'GO:0016787' 'GO:0005215'
      'GO:0016787' 'GO:0006412'
      'GO:0006810' 'GO:0030533'
      'GO:0008150' 'GO:0005215'
      'GO:0008150' 'GO:0006412'
      'GO:0008150' 'GO:0016787'
      'GO:0008150' 'GO:0006810'
      'GO:0006810' 'GO:0006412'
      'GO:0016192' 'GO:0003774'
      'GO:0006810' 'GO:0005215'
      'GO:0005215' 'GO:0030533'