Bed.Bed4type item = private {chrom : Base.string;chrom_start : Base.int;chrom_end : Base.int;name : Base.string;others : Base.string Base.array;}val sexp_of_item : item -> Ppx_sexp_conv_lib.Sexp.tval item_of_sexp : Ppx_sexp_conv_lib.Sexp.t -> item