All foods containing egg white – which are quite a number of products. Its proteins may behind the following naming: yolk, egg white, ovalbumin, livetin, albumin, lysozyme, E 1105, globulin, ovomucoid, lecithin, E233. Be aware that also wine can contain egg white.
In cooking, you can replace the binding effect of egg white by mixing 1 tablespoon of soybean flour with 2 tablespoons of water to a paste. Depending on your reactions, you may as well use maize flour, potato flour, or rice flour.