Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

The letter was signed by committee chairman Fred Upton, R-Mich., and ranking member Frank Pallone Jr., D-N.J., as well as Rep. Tim Murphy, R-Pa., chairman of the subcommittee on oversight and investigations, and Diana DeGette, D-Colo., the subcommittee’s ranking member.

Answer: position_held: Frank Pallone, member