2.12 Materials
Bradykinin fragment BK-(1-7) [RPPGFSP] was purchased from GenOne Biotechnologies (Rio de Janeiro, Brazil). The heavy-isotope labelled BK-(1-9) [H-Arg-Pro-[13C5;15N]Pro-Gly-Phe-Ser-Pro-Phe-Arg-OH; or simply RPP(*)GFSPFR] was purchased from Bachem (Torrance, CA, USA). Unless otherwise stated, all reagents were purchased by Sigma (Saint Louis, MO, USA).