Computes normalized cycle threshold (Ct) values (delta Ct) from raw quantitative polymerase
chain reaction (qPCR) Ct values and conducts test of significance using t.test(). Plots expression
values based from log2(2^(-1*delta delta Ct)) across groups per gene of interest. Methods for calculation
of delta delta Ct and relative expression (2^(-1*delta delta Ct)) values are described in:
Livak & Schmittgen, (2001)