One PC1 commercial monoclonal antibody is available from Santa Cruz, which is originally generated by Dr. Peter Harris. Unfortunately it is only used for WB. Endogenous PC1 expression level is generally very low in adult. PC1 can be cleaved at a few sites makes detection more difficult. Some antibodies have been recently developed by Baltimore PKD core. You may ask Drs. Feng Qian or Terry Watnick. PC2 detection is relatively easy. Good luck.