12 Science Biolabs, Belt fed and Beaconed. With integrated spoilage handling.
3 Flavors: A combinator version to compact delivery. Allowing another belt for spoilage. The combinator must be set to the 4 sciences on the inner belts. Agriculture must NOT be one of them as there is no spoilage handling for the chest.
A belt woven version to sneak the last belt in. If you are OK with that technique.
A perpendicular belt version, so you handle the spoilage on one of the edges.