eleminating first value in pair

i have some values 

fn1=

   {837x3 cell}
   {836x3 cell}
   {835x3 cell}
   {834x3 cell}

;
;
{4x3 cell}
{3x3 cell}
{2x3 cell}
{1x3 cell}

inside each cell i have values like for example

    fn{1,1}

    'Genes'    'T0&T2'  'T2&T4'  'T4&T6'
    'YAR029W'  'dd'  'dd'  'du'
    'YAR062W'  'du'  'ud'  'du'
    'YAR068W'  'du'  'uu'  'uu'
    'YBL095W'  'du'  'ud'  'du'
    'YBL111C'  'uu'  'ud'  'du'
    ;
    ;

another 

    fn{8,1}

    'Genes'  'T0&T2'  'T2&T4'  'T3&T5'  
    'YBR074W'  'du'  'ud'  'uu'  
    'YBR096W'  'uu'  'ud'  'ud'  
    'YBR138C'  'du'  'ud'  'du'  
    'YBR235W'  'ud'  'dd'  'ud'  
    'YBR239C'  'dd'  'dd'  'du'  
    'YBR241C'  'du'  'uu'  'uu'  
    'YBR255W'  'dd'  'dd'  'du'  

now i need to change only first row value for all combination

another matrix has first row values as 

row={
'YAR029W'  'd'  'd'  'd'
'YBR074W'  'd'  'u'  'u'}  

'Genes'    'T0&T2'  'T2&T4'  'T4&T6'
  'YAR029W'  'd'  'd'  'd'
  'YAR062W'  'du'  'ud'  'du'
  'YAR068W'  'du'  'uu'  'uu'
  'YBL095W'  'du'  'ud'  'du'
  'YBL111C'  'uu'  'ud'  'du'

    'Genes'       'T0&T2'  'T2&T4'  'T3&T5'  
    'YBR074W'  'd'  'u'  'u'  
    'YBR096W'  'uu'  'ud'  'ud'  
    'YBR138C'  'du'  'ud'  'du'  
    'YBR235W'  'ud'  'dd'  'ud'  
    'YBR239C'  'dd'  'dd'  'du'  
    'YBR241C'  'du'  'uu'  'uu'  
    'YBR255W'  'dd'  'dd'  'du'  

please help i want to perform for all fn1 values

[per isakson]

How does this question differs from your last question, finding same gene combination?

[Pat]

it doest not differ ,i want to make a new thread ,that was complicated to read

[Jan]

Your thread is still complicated to read. The definition of fn1 has no valid Matlab syntax and we have to guess what you mean. Afterwards the variable fn appears without a definition. The meaning of the actual question is not clear also:

 now i need to change only first row value for all combination

Change what to what, what is "the first row value" and what combinations do you mean?

[Pat]

fn1 is 

fn1=

     {837x3 cell}
     {836x3 cell}
     {835x3 cell}
     {834x3 cell}

in each cell i have genes as stated above 

i have another matrix for example(it consists of 836 rows)

rownew={
'YAR029W'  'd'  'd'  'd'
'YBR074W'  'd'  'u'  'u'}  

i want to replace every first row of fn(1,1),,,fn(836,1),with rows in variable rownew and need output as stated above

please help