Custom Perl script for extracting SNPs

Perl program used to extract SNPs. Properly accounts for REFSKIP characters (i.e., "<" and ">") that result from spliced alignments and seemed to be problematic in more widely available SNP calling packages, such as samtools and varscan.

用于提取单核苷酸多态性（Single Nucleotide Polymorphism，SNPs）的Perl程序。该程序可妥善处理由剪接比对产生的REFSKIP字符（即“<”与“>”），而这类字符在samtools、varscan等广泛使用的SNP检测工具包中往往会引发问题。