Selective replacement of cell elements into NaN based on some conditions

I have an array of cells m = 1*36 cells.

Each cell has n1*1, n2*1,n3*1......n36*1 double elements (each cell is a column vector of different lengths,n1,n2...n36 etc)

I wish to retain the cells where ni (i=1 to 36) > =200 and for cells where ni<200, I want to replace by NaN

I shall be grateful if I have some direction in this regard.

Thanks in advance.