How many letters does the top answer for “tiny bits of protoplasm found in vertebrate blood; essential for blood clotting” have?

The most common answer is platelet (8 letters).

Crossword clue: tiny bits of protoplasm found in vertebrate blood; essential for blood clotting

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

platelet 8 letters wn-def

tiny bits of protoplasm found in vertebrate blood; essential for blood clotting

thrombocyte 11 letters wn-def

tiny bits of protoplasm found in vertebrate blood; essential for blood clotting