how to replace too many if statements

Hi all,

Iam building a code in bioinformatics field.. I have 2 matrix comeing from a certain code as follows:

m1 =   
      'GO:0008150'    'GO:0016740'
      'GO:0016740'    'GO:0016787'
      'GO:0016787'    'GO:0006810'
      'GO:0008150'    'GO:0006412'
      'GO:0016740'    'GO:0004672'
      'GO:0016740'    'GO:0016779'
      'GO:0016787'    'GO:0004386'
      'GO:0016787'    'GO:0003774'
      'GO:0016787'    'GO:0016298'
      'GO:0006810'    'GO:0016192'

m2 =   
    'GO:0008150'    'GO:0016787'
    'GO:0008150'    'GO:0006810'
    'GO:0006810'    'GO:0006412'
    'GO:0016192'    'GO:0003774'
    'GO:0006810'    'GO:0005215'
    'GO:0005215'    'GO:0030533'

in each matrix, the first column is the parent of the second one... I need from the code to find the part of graph which can determine all relations between these cells... I have to find cell from column 1 that occurance in column 2, then take the cell from column 1 but from the same row of column 2 and find the similarity between it and onother cell in column 2 .. and so.. it is something like depth first search in graph theory

In general, How can I make a dynamic code (recursive) that can replace the following if statements:

for k=1:length(m1)
for ii=1:length(m1)         
for j=1:length(m1)
for i=1:length(m2)
 for e=1:length(m1)
   if isequal(m2{i,1},m1{j,2})
      x1=[m1(j,1) m2(i,2)];
      x11=[x1;x11];
       if isequal(m1{j,1},m1{k,2})
          x2=[m1(k,1),m2(i,2)];
          x22=[x2;x22];
             if isequal(m1{k,1},m1{ii,2})
              x3=[m1(ii,1),m2(i,2)];
              x33=[x3;x33];
                 if isequal(m1{ii,1},m1{e,2})
                 x4=[m1(e,1),m2(i,2)];
                 x44=[x4;x44];
                      .
                      .
            and so..x_total=[x11;x22;x33;x44...]
end
end
end
end
end
end
end

Note that the if statemtnes are not determined( it depends on m1 & m2 which are also not always constants)