| Answer | Crossword Clue |
|---|---|
| phycocyanin | Any of a group of blue photosynthetic pigments present in cyanobacteria |
| phycocyanins | Any of a group of blue photosynthetic pigments present in cyanobacteria |
| phycobilin | any of a class of red or blue-green pigments found in the red algae and cyanobacteria |
| phycobilins | PHYCOBILIN, any of a class of red or blue-green pigments found in the red algae and cyanobacteria |
| porphyrin | any of a large group of red or purple crystalline pigments present in plant and animal tissues |
| porphyrins | PORPHYRIN, any of a large group of red or purple crystalline pigments present in plant and animal tissues |
