[19] According to ensembl.org, LNPEP has 5 transcripts but only one major expressed isoform (NM_005575.3)

2008 Jun;25(6):1412-9 (particularly any one of those described in Table I of this reference), any one of the modified amino acids disclosed in US 5,866,536 (particularly any one of compounds I to CXXIII, as disclosed in US 5,866,536 which is incorporated herein by reference, or a pharmaceutically acceptable salt or solvate thereof, such as a disodium salt, an ethanol solvate, or a hydrate of any one of these compounds), any one of the modified amino acids disclosed in US 5,773,647 (particularly any one of compounds 1 to 193, as disclosed in US 5,773,647 which is incorporated herein by reference, or a pharmaceutically acceptable salt or solvate thereof, such as a disodium salt, an ethanol solvate, or a hydrate of any one of these compounds), any of the nanoparticles described in WO 2011/133198, any of the polymer preparations described in US 2015/174076 and/or a hydrogel (e.g., as described in Torres-Lugo M et al
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GHK-Cu (glycyl-L-histidyl-L-lysine copper) is a naturally occurring tripeptide-copper complex first isolated from human plasma by Pickart and Thaler in 1973
Although it has a much higher porosity than the other two materials, it remained stable over the observation period of 6 months