Expression of zebrafish sHSPs during development and in response to heat shock. At left is shown relative expression levels during normal development. Because of the huge range in expression levels between hspb1 and the remainder of the sHSPs, each value was multiplied by 10⁵ and the natural log of this number was converted to greyscale intensity values, where white corresponds to the maximum observed expression level (that of hspb1 at 12 hpf). At right is heat shock-induced expression as fraction of normal. White in this case corresponds to 50-fold or greater upregulation (see Table 2 for actual values). Values are displayed on a linear scale.