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Here, we show co-storage of human Prolactin (PRL), which is associated with lactation in mammals, and neuropeptide galanin (GAL) as functional amyloids in secretory granules (SGs) of the female rat. Using a wide variety of biophysical studies, we show that irrespective of the difference in sequence and structure, both hormones facilitate their synergic aggregation to amyloid fibrils. Although each hormone possesses homotypic seeding ability, a unidirectional cross-seeding of GAL aggregation by PRL seeds and the inability of cross seeding by mixed fibrils suggest tight regulation of functional amyloid formation by these hormones for their efficient storage in SGs. Further, the faster release of functional hormones from mixed fibrils compared to the corresponding individual amyloid, suggests a novel mechanism of heterologous amyloid formation in functional amyloids of SGs in the pituitary.<\/jats:p>","DOI":"10.7554\/elife.73835","type":"journal-article","created":{"date-parts":[[2022,3,4]],"date-time":"2022-03-04T15:15:14Z","timestamp":1646406914000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.73835","source":"Crossref","is-referenced-by-count":18,"title":["Co-aggregation and secondary nucleation in the life cycle of human prolactin\/galanin functional amyloids"],"prefix":"10.7554","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8153-8651","authenticated-orcid":true,"given":"Debdeep","family":"Chatterjee","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02qyf5152","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Biosciences and Bioengineering, Indian Institute of Technology 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