Tina-quant Complement C4 ver.2, Catalog 05991994190
Roche has confirmed customer complaints of low quality (QC) recovery and invalid calibrations for the identified products. A discoloration (yellow color) was observed and is the result of cross contamination between the R1 and R3 reagents.
Domestic distribution nationwide.
https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=Z-0103-2021