part of part of develops from develops from expresses chondrocyte fibrochondrocyte progenitor cell fibrochondrocyte meniscus fibrochondrocyte A chondrocyte with hybrid fibroblastic-chondrogenic characteristics found in fibrocartilage, particularly in the avascular inner zone and transitional middle zone of the meniscus. In humans, fibrochondrocytes are marked by predominant expression of type I collagen (COL1A1) and fibril-associated collagens (COL3A1, COL6A1), while retaining type II collagen (COL2A1) expression and exhibiting lower SOX9 than hyaline chondrocytes. This molecular profile underlies the synthesis of abundant type I collagen essential for fibrocartilage matrix and reflects an intermediate phenotype between fibroblast and chondrocyte. fibrocartilage chondrocyte FC collagen alpha-1(I) chain collagen alpha-1(III) chain collagen alpha-1(VI) chain fibrocartilage