PRODUCTS:   Sea-Block™ | Sea-Grow™-F | Proteins Sea-Block™ Sea-Block™ is a unique blocking reagent derived from fish plasma for use in diagnostics. It has the competitive advantages of no mammalian proteins. Since fish plasma has no lgG, there is no cross-reactivity with Protein A. Sea-Block™ is sold through Pierce, EMD Biosciences Inc. and East Coast Biologics, Inc.