lanbi gismu

x₁ is a quantity of protein/albumin of type x₂ composed of amino acids (sequence/jo'u) x₃ .

In notes:

ladru: x₁ is made of/contains/is a quantity of milk from source x₂; (adjective:) x₁ is lactic/dairy.
sovda: x₁ is an egg/ovum/sperm/pollen/gamete of/from organism [mother/father] x₂.
ba'arlanbi: x₁=l₁=b₁ is a quantity of antibody of isotype/class x₂=l₂ for marking pathogen x₃=b₂
tcelula: x₁ is a biological cell