Arrays are given in rows and experiment descriptors are given in columns. Row
names contain array names.
"Time" indicates the values that variable Time takes in each
hybridization. There are 4 time points, which allows an up to 3 degree
regression polynome.
"Replicates" is an index indicating replicate hyridizations, i.e. hybridizations are numbered, giving replicates the same number.
"Control", "Tissue1", "Tissue2", "Tissue3" and
"Tissue4" columns indicate array assigment to experimental groups,
coding with 1 and 0 whether each array belongs to that group or not.