Position weight matrix for the 3' and the 5' splice site. The rows represent the bases A, C, G and T. Each column stands for one sequence position in the consensus sequence. Each entry represents the normalized number of occurrences of the base at that position. Each row is added to 1. For the 3' splice site a surrounding of 23 bases and for the 5' splice site a surrounding of 9 bases is considered important.